The back panel has a recess 11 which is fixedly anchored and has {HEAD ~ a cross arm} 10 for {TAIL ~ a grinding head} guided in it 
for
The back panel has a recess 11 which is fixedly anchored and has { HEAD ~ a cross arm } 10 for { TAIL ~ a grinding head } guided in it
OTH OTH 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 OTH OTH