The first set of peripheral teeth and the second set of peripheral teeth are each at {HEAD ~ a common radius} from the common pivot point on opposite sides of {TAIL ~ the transfer gear} 
The first set of peripheral teeth and the second set of peripheral teeth are each at { HEAD ~ a common radius } from the common pivot point on opposite sides of { TAIL ~ the transfer gear }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL