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