Worn keys can damage “wafer” tumblers or pins inside the lock cylinder so that the key can’t turn, preventing the ignition from unlocking. The wafers themselves can wear down (so much so ...

Following the ancient trade routes, the tumbler lock traversed the Mediterranean ... The precision-locking mechanism featured a series of wafers that lift to different heights once the ...

The big breakthrough was when I acquired several Safe Skies locks that used wafer-tumbler mechanisms instead of pin-tumbler mechanisms, because of the different mechanical design I was able to ...