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