The program carrier can be coupled selectively with one of the two drive rings by means of a coupling member adjustable to radii of {HEAD ~ different size} on {TAIL ~ the same radius vector} 
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The program carrier can be coupled selectively with one of the two drive rings by means of a coupling member adjustable to radii of { HEAD ~ different size } on { TAIL ~ the same radius vector }
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 HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL