{HEAD ~ The door construction} 7 wherein the block of resilient material includes a recess for engagement by {TAIL ~ the ball bearing} 
{ HEAD ~ The door construction } 7 wherein the block of resilient material includes a recess for engagement by { TAIL ~ the ball bearing }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL