Quick comment on the screw issue.
I want to comment here, before this turns into yet another lock company bashing session. I have in my stock a half dozen or so production locks that have this problem. These including some from the best production lock companies, and include several examples of locks of two different designs by Chambers.
As I see it, this is not a mistake on the part of the lock company. Rather, if there is a mistake to be noted it is in the mistaken assumptions of the customers. The Chambers locks I am talking about are outstanding, excellent craftsmanship, assembled correctly, and everything is square and with appropriate clearance, BUT still waiting for final polish and tuning. If a guy tries to just tighten down the screws without first tuning, polishing, relieving metal where necessary, then he will find that they bind.
The problem is there, but loosening the screws is not really a good solution. The better solution is to tune the lock.