I noticed that some joints on our toys can't simply be fixed by tightening a screw. I'm referring mostly to the G1 Dinobots. I've got a very nice Grimlock, but his arms are loosey goosy and I tried hard to tighten the screw to get the arm tighter. I feel like I've gotten it as tight as I can, but still too loose. Is there any tricks to tightening up these vintage limbs? I like to pose my bots with arms straight out holding their gun. But most of them just want to flop down shooting the ground. Seems basic screw tightening does not work. Suggestions, tips?