first and second oppositely disposed slotted portions each having {TAIL ~ a plurality} of {HEAD ~ slots} each dimensioned to receive a tooth of the motion transmission device 
first and second oppositely disposed slotted portions each having { TAIL ~ a plurality } of { HEAD ~ slots } each dimensioned to receive a tooth of the motion transmission device
OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH