{TAIL ~ The engagement} of the spring and the stop with the drive lever yields {HEAD ~ lever arms} of different lengths 
{ TAIL ~ The engagement } of the spring and the stop with the drive lever yields { HEAD ~ lever arms } of different lengths
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH