The rollers 4 flex the flexible gear 2 radially outward causing it to engage at a plurality of {HEAD ~ flexibly bulged regions} with {TAIL ~ the rigid gear} 1 
with
The rollers 4 flex the flexible gear 2 radially outward causing it to engage at a plurality of { HEAD ~ flexibly bulged regions } with { TAIL ~ the rigid gear } 1
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH