Some photos of the lock for a wheellock a friend is building from scratch. He is an experienced machinist and gunsmith but the mainspring is giving him some trouble. He has had a couple break and the current one is working but not completely satisfactorily. They have failed in the same place and from what I have read here they have given others similar problems too. I'm sure he will resolve the issue and move on to complete the gun. I thought you might enjoy some photos of the lock and also of a matchlock he built a few years ago.