I am replacing my stock seat on an '07 Heritage, and I am trying to figure out how to remove the two knob screws that hold the seat and pillion to the rear fender. The Le Pera seat I am installing does not use the same hardware. Does anyone have advice on how to remove these bolts easily? When I depress them, they seem to "spring" back up, and I would rather not remove the tire to get at them. Thanks!