The arch block 12 has a curved back side and a toothed front side and is biased by the first end of the spring 13 into engagement with {HEAD ~ the ratchet} wheel 11 in a radial direction relative to the circular peripheral wall to limit rotary motion of the ratchet wheel 11 to {TAIL ~ one direction} 
The arch block 12 has a curved back side and a toothed front side and is biased by the first end of the spring 13 into engagement with { HEAD ~ the ratchet } wheel 11 in a radial direction relative to the circular peripheral wall to limit rotary motion of the ratchet wheel 11 to { TAIL ~ one direction }
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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL