Young Gun Tip#133

Bottom pin and top pin are matched set, in other words a shallow called #1 cut in key requires a short bottom pin (with tapered end), and a long top pin (end with little tit pointing up to receive spring). All pairs of bottom & top pins, numbers 1 through 5, have the same combined height, and must be kept as a pair, or spring binding will result if too tall or spring being captured in rotating plug if stack too short.

A better way to perform a back yard repining is to compare both keys to identify is any depth of key cuts are the same between the two. Once several same height cuts are identified, dump only one chamber at a time, replacing dumped pins with the correct pair need to allow replacement key to turn. Chances are great that only two or three cuts will be the same, so use those, and leave the remaining chambers empty.

This is not the best way to secure your car, as the number of other cut keys able to operate that lock increase dramatically.

A better solution would be to spend a few bucks, and have a locksmith re-pin the lock with fresh pins and springs which will make for a smoother operating, longer lasting lock.