The stop comprises {HEAD ~ a rod} 37 which is slidable in {TAIL ~ a bearing} 38 mounted on the carrier 18 
is slidable in
The stop comprises { HEAD ~ a rod } 37 which is slidable in { TAIL ~ a bearing } 38 mounted on the carrier 18
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH