by zeke79 » 11 Dec 2005 18:57
What kind of cylinder is it? Euro profile? Mortise? More information on your particular lock will help us give you an answer.
For the best book out there on high security locks and their operation, take a look at amazon.com for High-Security Mechanical Locks An Encyclopedic Reference. Written by our very own site member Greyman! A true 5 Star read!!