I can't recall a guide or roller mounted through the glass. Only a plastic rivet attaching the bottom of a door glass to the regulater. Best approach to that thing I have found is to drive the center pin on through it rather than try to back it out. If it breaks anyway it can be replaced with a 1/4" dia bolt and a small piece of 1/4" fuel line , 2 flat washers, and a nyloc nut.