A cam plate is disposed in the engine housing and supported for {HEAD ~ rotation} about {TAIL ~ the longitudinal axis} 
about
A cam plate is disposed in the engine housing and supported for { HEAD ~ rotation } about { TAIL ~ the longitudinal axis }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL