In {TAIL ~ the linear version}, {HEAD ~ the power transfer shaft} is attached to a piston head 
In
In { TAIL ~ the linear version } , { HEAD ~ the power transfer shaft } is attached to a piston head
REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH