How do they stay in there?My instructor showed me his made in the phillipines balisong the other day,and whilst I will admit the maker did a good job with probably very limited tools and materials,I think I can make something much better.My question is how do those neat little stop pins, I see on the balisongs in the gallerys here,stay in there.Are they just a press fit?Slightly tapered?Or maybe soldered?I was thinking of a small allen screw but that would only match up on one side.Any hints on how you guys do it would be greatly appreciated. Thanks in advance