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I'm not a big fan of using non-LEGO parts, but I tried this a few months ago and I thought it's worth sharing. To firmly secure a pin in a pin-hole without making the pin or pin-hole useless after disassembly, you can drive a small set-screw (I used M4x3) into the pin. I used the back-side of a knife to avoid the pin from rotating while driving in the screw. but be careful not to damage that end of the pin. I drove in the screw no further than to make a flat surface with the outer edge of the pin. EDIT: Even though I tried this, I decided not to use it eventually. Let me explain why. For me building Technic constructions is like solving complex puzzles - or at least I like to think of them as complex. If I would arrive at a point where I would need this kind of compromise solution, my conclusion would be there is something wrong with my construction and regard the puzzle as yet unsolved. You could for instance use this to avoid a pin from being pulled out of a pin-hole when a construction is stressed. However, if a construction relies on a pin this way, I tend to think of the construction as being no good. The construction should be such that forces are applied orthogonal - not longitudinal - to the pin-connection. For me the only useful application of this would be to eliminate slack in, or add rigidity to a - already properly designed - construction. Not to fix a poor construction.