I have power rear window on my 84 K5, and the outside control didnt work. THe silver piece that the key goes in to operate the switch, I donno what you call it. Anyways, I took the thing apart to see if it was broken, which is a real pain in the tail. Everything looks fine, with the exception of the black thing the key moves. Its not thouching the contacts right. Any fixes yall know of? Any place I can get the parts to replace the whole unit?