Axially spaced apertures in the housing support {TAIL ~ a manually controlled shaft} for {HEAD ~ rotation} 
Axially spaced apertures in the housing support { TAIL ~ a manually controlled shaft } for { HEAD ~ rotation }
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD