my rear elec windows hav both stopped but, when i pressed the drivers side to go up it just slipped down and eventually got stuck half way up.i removed door card and saw a wire wich was real frayed and was jamming i couldnt free it off and couldnt get the window up so i had to cut the wire now my window is held in place with a screwdriver can I buy the wire and re-fit or am i gonna need a full unit any1 any ideas where is best to look?