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