The assembly 4, wherein {TAIL ~ the cam gear teeth} are of varying shapes and {HEAD ~ dimensions} 
The assembly 4 , wherein { TAIL ~ the cam gear teeth } are of varying shapes and { HEAD ~ dimensions }
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD