The other end of the oscillating arm 24 is formed with a plurality of internal threads 241 adapted to engage with a gear 25 fixedly mounted on {HEAD ~ an output shaft} of {TAIL ~ a motor} 20 
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The other end of the oscillating arm 24 is formed with a plurality of internal threads 241 adapted to engage with a gear 25 fixedly mounted on { HEAD ~ an output shaft } of { TAIL ~ a motor } 20
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 REL TAIL TAIL TAIL TAIL TAIL TAIL OTH