{HEAD ~ Contact} between the projection 8b on the cam gear 8 and the elastic piece 10a of the sector gear 10 offsets backward torque induced by the engagement of the sector gear with the rack 11, and absorbs {TAIL ~ any mechanical shock} 
absorbs
{ HEAD ~ Contact } between the projection 8b on the cam gear 8 and the elastic piece 10a of the sector gear 10 offsets backward torque induced by the engagement of the sector gear with the rack 11 , and absorbs { TAIL ~ any mechanical shock }
HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL