i bought 5 dollar skis froma yard sale. i guess they're like 1980 models lol .. well anyways i need some info on how to adjust the bindings. there are 2 nails in the sides of it. and a nail on the back, we unscrewed the 2 nails on the side but i think there's a hidden nail someonewere but i cant find it.. can seomone give me a link on old skis and bindings.. or tell me hwo to adjust them? thanks