The extension piece 22 is provided with a stop 32 for {HEAD ~ the lever arm} 27 of {TAIL ~ the drive lever} 24 
of
The extension piece 22 is provided with a stop 32 for { HEAD ~ the lever arm } 27 of { TAIL ~ the drive lever } 24
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH