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