In the diagram below circled in red, the rubbers that wrap the inlane posts are listed as bumpers. When I try to put on a 7/16" OD bumper (http://www.pinballlife.com/index.php?p=product&id=35) it is too small and tears apart as I try to stretch it onto the post. However, if I use a 3/16 ID ring (http://www.pinballlife.com/index.php?p=product&id=83), it is too big and is loose on the post.
Am I missing something?