Referring to FIGS 1 and 2, {HEAD ~ roller} 54 is adjustably positioned on the contoured surface 52 of {TAIL ~ 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 means of pivot pin 58 
Referring to FIGS 1 and 2 , { HEAD ~ roller } 54 is adjustably positioned on the contoured surface 52 of { TAIL ~ 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 means of pivot pin 58
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL 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