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