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