The cam plates are configured such that {TAIL ~ arcs C1} are linked alternatingly with {HEAD ~ arcs C2} 
The cam plates are configured such that { TAIL ~ arcs C1 } are linked alternatingly with { HEAD ~ arcs C2 }
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD