I think this might be the most appropriate place to put this. Honestly the number of different places is kind of overwhelming..I wanted to make a locking mechanism for the blade on a 58mm SAK...I pondered it for an hour or so...(Image removed from quote.)and this is what I came up with:(Image removed from quote.)maybe someone has come up with something better but I find this works like a charm. The pen works as part of the lock, when extended the blade can't move. However, if you retract it, the collar can be slid right off the blade. The blade functions as a great awl now, something I couldn't do safely before. Cheers,H.G.