Referring to FIGS 1 and 2, roller 54 is adjustably positioned on the contoured surface 52 of cam 50 by a positioning arm comprising a slotted yoke 60 which embraces connecting rod 56 and roller 54 and is pivotally attached thereto by {HEAD ~ means} of {TAIL ~ pivot pin} 58 
of
Referring to FIGS 1 and 2 , roller 54 is adjustably positioned on the contoured surface 52 of cam 50 by a positioning arm comprising a slotted yoke 60 which embraces connecting rod 56 and roller 54 and is pivotally attached thereto by { HEAD ~ means } of { TAIL ~ pivot pin } 58
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH