I'm making some simple motorized (but small) clothing accessories, and part of it is actuated by pulling on a length of fishing line. I'm trying to figure out the best way to do that. I was thinking a little spool, but there are some problems. The fishing line could go slack if the part is pushed on, and I need the line to not unspool. Second is that it needs to be really small... the closer to about a half centimeter (from flange to flange), or less, the better. I'm having a hard time finding something that small. Is there some better way than a spool?