[FrankJ]

This years game is very rough on bumpers. Irregardless of what the rules say (not to say don't follow the rules as well) your bumpers need to be sturdily attached to your robot. You should be able to pick up & pull your robot around by the bumpers. You are allowed to make pocket holes for bolt heads. Rather or not you should do that depends on how well the bolt heads support the bumpers. It is a judgment call.