The separation of top and bottom pins is very brief, but at this moment the lock cylinder is easily turned. Last Updated: February 19, 2020 wikiHow is where trusted research and expert knowledge come together. Learn more... “Bumping” is a lock-picking technique that refers to the repeated striking motion used to dislodge the pins inside a lock. Any pin-tumbler lock that does not include specific defenses against Also, with a little movement, the bump key is inserted fully and depends on the pins’ spring tension for alignment. Using a principle of physics similar to what makes “Newton’s cradle” work, the energy produced from striking the bump key is transferred to the pins inside the lock, causing them to jump and create a temporary shear line, allowing just enough time for the intruder to quickly turn the lock and open the door. How to Make a Bump Key Using these values, you'll make your first cut using the first value (key shoulder to first cut), then each subsequent cut will be spaced at equal intervals using the second value (distance between centers). Too much force and the bumper will just damage the lock so there needs to be just enough force applied. Draw triangular teeth from the points along that line at which the pins will sit, one tooth between each groove. Be safe and please use common sense. You can also find this out by looking up the model of lock online. Try it out in a few cylinder locks to see if it fits before filing it to the right specifications. Find a key that fits into the lock you’re attempting to bump. No. If you’ve tried over and over and still can’t get the key to turn, either the grooves you filed in the valleys are not the right length or the deadbolt needs to be turned in the opposite direction. Typical bump keys are partially inserted into the lock to ensure that one notch or pin remains between it. 4.4 out of 5 stars 28. They are inexpensive, easy to make and acquire, and in the wrong hands, could be a serious problem for homeowners. An entire set of bump keys -– containing 20 keys for locks from a variety of manufacturers –- cost $50. Key Take Aways. Once inserted, pull it back slowly until you feel it click twice. Doing this requires a specially cut key, known as a bump key, that with the right application can be used to force open 90% of cylindrical locks. For instance, a bump key designed to open a pin tumbler lock will open any pin tumbler lock, providing the user knows how to correctly use it. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/6\/69\/Bump-a-Lock-Step-1-Version-3.jpg\/v4-460px-Bump-a-Lock-Step-1-Version-3.jpg","bigUrl":"\/images\/thumb\/6\/69\/Bump-a-Lock-Step-1-Version-3.jpg\/aid110884-v4-728px-Bump-a-Lock-Step-1-Version-3.jpg","smallWidth":460,"smallHeight":259,"bigWidth":728,"bigHeight":410,"licensing":"