[EricH]

Easy use of bolts: use a t-nut (blind-nut) on the inside of the bumpers (well secured--you don't want to have to take the bumper apart to find it) and put a hole through the frame and bumper backing (and cloth as well) for the bolt. When you take the bumpers off, attach the bolts to them so you don't lose 'em. If you have something on the outside of your robot, like an axle end, try shaping a small hole/cavity for it. (Then mark which side that bumper goes on and which side is up.)