Hello I have a really nice Singer 500 that I'm exploring. It sewed great until i had to wind a bobbin and the hand-wheel does not stop the needle from running. I have other singers like this so i know how to disengage for bobbin-winding but the hand-wheel turns and turns. I'm a little concerned bc i oiled everything before i started playing with it and i'm wondering if i may've put oil somewhere i shouldn't have? I guess I'd like to know if this is an $$ repair or something I can do myself? I am not wanting to spend $80 on it bc I have a fully functioning 500 already. I got great stitches from this one and its in nice condition otherwise. Any advice/help much appreciated!!