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