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