Rekeying a Seatlock
Recently I had occasion to replace the seatlock in my R100, which was old, and rotated in its housing, making it hard to actually lock the seat. I checked in with my local dealer, and they said I could get a generic lock, with a matching key, for $23, or I could get a matched lock (set up to work with my existing key) for $50 and 3 months wait.
Take a look at this page in general (lock picking) and particularly page 5 from that series for some good visualizations of how a pin-and-tumbler lock works. This is the type of lock used in the seat of the R100 (and probably many other similar vintage Airheads).
This procedure is broken down into 4 basic parts: getting the lock out of the bike, getting the pins out of the old lock, putting them in the new lock, and putting the lock back in the bike. While the specifics of installation, removal and pin-access may not apply to other locks on the bike (or in general), the rekeying steps can easily be applied to other locks.
Without any instruction, it took me about 30 minutes to do the actual rekeying, having spent 15 minutes beforehand, removing the lock. Reinstalling the lock took about 10 minutes, but would have