At each limit of movement, the drive mechanism encounters resilient stop members which reverse the direction of motion of the drive mechanism and included hammer bank following {HEAD ~ a natural cosine function} of {TAIL ~ the spring mass} of the stop members and with low kinetic energy loss 
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At each limit of movement , the drive mechanism encounters resilient stop members which reverse the direction of motion of the drive mechanism and included hammer bank following { HEAD ~ a natural cosine function } of { TAIL ~ the spring mass } of the stop members and with low kinetic energy loss
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 HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH