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