This might seem like an odd question but I'm curious to know if the nylon (or whatever the material is) locknuts lose their effectiveness on reuse. I have an application (a ham antenna) where I made some assembly mistakes and had to remove several stainless steel fasteners and I thought it would be better to use new locknuts (which I did). It would be really, really bad if an antenna fastener becomes loose. Now I have six or eight used locknuts and I'm sure they would be fine for almost all applications.
This is more of an esoteric question but I wonder if anybody else has researched this topic.