Yes, some of the guys and gals here are phenominal.

They are certainly worth the £15 you paid. And yes, it has been advertised as unpickable. Then again, so has BiLock.

Probably more true with Bramah locks.
More info, with pictures, can be found in High Security Mechanical Locks, by Graham Pulford, pages 205-208. He is a member here, too! The Picard, Fontaine (French locks) and the Supra (American) work in a similar fashion.

Gordon
Just when you finally think you have learned it all, that is when you learn that you don't know anything yet.