I got a somewhat decent G1 Sunstreaker from a friend and he's just missing his parts (hands, missles, boosters). I am having trouble telling if the buttons on his wrist are a chipped or not. It feels a bit rough I guess. I'm wondering if I should just file/sand them smooth or find a super junker Sunstreaker and switch out the buttons. Can anyone help me? Hard to tell using photos from Seibertron.