Fellow customer from posereference.tumblr.com tipped us off on a FANTASTIC way to tighten joints. I've been testing it out recently and it's been working really well. The idea is to coat a joint with a thin layer of superglue. Let it dry into a clear hard shell around the joint (I'd suggest over night) and then reinsert the part. Just make sure you apply it slowly so you get an even thin layer around the joint. I tried it on a the hip ball joint and the fitting was even better than when new. I would avoid applying it into sockets as the glue could pool and buildup inside unevenly.