Installing a new regulator, its the rear drivers side. There's 3 10mm that mount the regulator to the door and one that secures the window, I've gotten 2 of the 3 that mount the regulator to the door but the one on the top on the left I can't seem to figure out how to get. There's a mounting hole to allow access, but the window prevents removing it. Anyone know of a way to remove all 3?