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