A bump key is actually a lock pick, a tool used to force many types of locks almost instantaneously. If the locks in your home are all Evva type, an Evva impact key is able to open all doors. You can make it from a blank key as long as you have the original key as a model. This type of key is associated with break-ins and burglary, but this article is for legal purposes only. Open doors only for valid and honest reasons, keep the lockpick in a safe place.
Steps
Part 1 of 3: Measure and Carve the Key
Step 1. Purchase a blank key that matches the original model of the lock you want to open
If you are looking to make a bump key for a Kwikset lock, you need to get a virgin Kwikset. To proceed, you need both the original working key and the blank key produced by the same manufacturer.
Some people build the lock pick without having a working model. In this case, you need an electronic gauge capable of appreciating the distances between the various pins of the lock - a complex procedure that is typically used only by thieves who do not have access to the original key
Step 2. Before continuing, review the key nomenclature, especially if this is your first time doing this job
This guide uses certain terms and expressions that refer to parts of the key. Knowing the jargon helps you make a more effective key.
- Length: refers to the entire length of the key from one end to the other; represents the largest size of the key itself.
- Groove: notch or indentation of the serrated part of the key. Each groove is adjacent to at least one peak.
- Peak: protrusion along the serrated edge of the key. Each peak can be steep or flat, but protrudes beyond the key body, plus it is adjacent to at least one groove.
- Maximum depth: the height of the deepest groove, this should never go beyond the track.
- Trace: narrow and straight groove that runs the length of the key. Each model has tracks of different sizes. Typically, it is located approximately in the center of the pen (the part of the key that goes into the lock).
- Joke: when the key is inserted into the lock, the stop is located in the upper part and just outside the access to the lock itself. It performs the task of locking the key to prevent it from going too deep.
Step 3. Use a fine-tipped permanent marker to bring the original key bitting back to the blank key
You need to know the position and maximum depth of each groove, as well as the length of the key. Place the model on top of the blank key, the only difference between the two is the jagged edge (ciphering) of the original one, while the bump one is smooth. You only have to report the notched edge.
The maximum depth shouldn't never cross the line of the trace, the longitudinal groove that is in the center of the pen.
Step 4. Lock the blank key in a bench vise
Position it so that the track and bottom edge are between the jaws, while the top should stick upward. You will need a file to shape the profile you drew. You can set aside the original key.
If you don't have a bench vise, find another way to hold the key steady while you file it. You have to recreate the grooves with a precise depth, so a tool that locks the key is indispensable
Step 5. Use the file to roughly carve the bump key according to the original one
Remove excess material to create the indentations and leave the peaks in place. Your main goal is not to carve never a groove beyond the maximum depth of the original. Initially, you need to reproduce the indentation roughly, later you can work on the details.
Part 2 of 3: Carving the Key
Step 1. Use a triangular or increasing diameter metal file to recreate the grooves in the bump wrench
The most important thing to pay attention to is the depth of each indentation. You must not never exceed and exceed the track that is on the bottom and you must never file beyond the maximum depth of the original key.
- Don't pay attention to the sharp peaks between the grooves for now, you will deal with them later.
- You should have the same number of grooves in the model key.
Step 2. File all the peaks by reducing their height so that they are only 4-5mm above the grooves
These elements are most likely too high and would cause the bump key to get stuck in the lock. Use the file to bring them to a height of a few millimeters. The correct measure is that which allows the key to release the lock without getting stuck in it; you will have to proceed by trial and error and do several tests.
- The peaks must all be the same height.
- They need to be tall enough to fit inside the lock.
Step 3. Use the file to work the key so that the peaks and grooves are the right height and depth
In the end, the impact wrench should look like a saw with a jagged, jagged edge. The peaks should not be too steep and the grooves should be evenly spaced, respecting the original key bitting. There is no problem if the bottom edge of the grooves is flat.
Step 4. Find the key stroke
Insert the one you just worked into the lock and make a note of where it stops without going any further. This is the stop between the jagged profile and the handle (the part you grab to use the key). The stop prevents the key from going too far into the lock, so that it stops at the exact point where the cut lines up with the lock itself.
Step 5. File the stop to flatten it
This portion prevents the key from fully penetrating the lock, but it is not useful for your purpose. When using a bump key you need to be able to control the depth of insertion to shake and open the lock. By eliminating the beat, you can position the clef however you like as you strike it. Use the file to remove the stop and align it to the height of the peaks, at a minimum.
Step 6. Work the tip
This is an optional step, but it helps you insert the key into the lock. The tip is clearly the portion that enters the lock first. If you have trouble inserting and turning the key, try filing the tip by a quarter or half millimeter.
- In this area you will need to insert small rubber spacers, so that the key bounces and comes back slightly when you hit it against the lock.
- Some industry professionals call this the "minimal movement method".
Part 3 of 3: Test the Bump Wrench (Optional)
Step 1. Insert the bump key into the lock and check the required length
You will be able to see the area where the joke should be. Draw a dot or line with a permanent marker just where the key protrudes from the lock, which is exactly where the stop should be.
Step 2. Put the rubber rings where you drew the marks
Insert them into the pen of the clef up to the beat area, starting with the line you drew. To use a bump key, the stop must be replaced with rubber rings, which allow a rebound movement every time you hit the lock. A well-crafted lock pick should move smoothly into the lock until the cipher lines up with the pins and should not get stuck.
- If you don't have any rubber rings, you can still try the key. However, you will need to insert it back into the lock after each bump. Professionals call this "pull-back" method.
- You can use any rubber ring, such as gaskets that you can buy in the plumbing sector of a DIY center, garden center, or hardware store.
Step 3. Insert the bump key
If you can hear a "click" when pushing it, you can move on to the next step. If not, move it away or consider filing the tip a millimeter more.
- If you have rubber rings, the key should bounce back to its original position every time you push and release it.
- Without rings, you will have to pull the key out a notch each time after pushing it.
Step 4. Rotate it slightly simulating the opening of the door
Apply gentle rolling pressure with one hand. You should act as if you are trying to turn the key to open the door.
Step 5. Tap the key lightly while it is inside the lock to force it open
You can use a small hammer, screwdriver handle, or other similar object while holding it in your free hand. Strikes a straight shot in the direction of the lock; hit the key several times while trying to turn it at the same time. You will probably have to make several attempts. Shake it lightly if necessary.
- If you have inserted the rubber rings, you can hit the key several times in quick succession.
- If not, you have to pull it out one notch at a time after pushing it. The work may be long, but not impossible.
Step 6. Open the lock and remove the key
Store it in a safe place and use it only for legitimate purposes. Remember that badly constructed or incorrectly used bump keys can irreversibly damage the lock. Only use this tool when you absolutely need it, as if you are not careful you may end up with problems far greater than you wanted to solve.
A little practice is required to develop "touch" (ie learning how much force to strike and how much to turn the key). Each lock is slightly different, but you can learn how to develop sensitivity with a little practice
Advice
- Be careful not to carve the grooves lower than the track.
- It takes some practice to master the "bumping" technique, that is, opening a lock with a bump key.
- If the key is made of soft metal, it could quickly deform, even inside the lock. This technique leads to better results when both the key and the lock are made of hard metals.
- Be careful not to squeeze the key in the lock; it is an event that can happen after hitting or shaking it. To reduce this risk, sand the bump wrench so there are few rough parts and build it with hard materials.
- When using a bump wrench, it applies very little tension.
Warnings
- Burglary is a crime. The information contained in this article is for informational purposes only.
- With this method it is possible to break or destroy the lock. Be careful and be gentle.
