said arch block having a curved back side and a toothed front side and being biased by said first end of said spring into engagement with said ratchet wheel in a radial direction relative to said wall for limiting rotary motion of said ratchet wheel within said chamber to one direction; said {HEAD ~ arch block} having a predetermined transverse width dimension, and a height of {TAIL ~ teeth} on said toothed front side of said arch block being approximately equal to a height of said ratchet teeth on said ratchet wheel 
said arch block having a curved back side and a toothed front side and being biased by said first end of said spring into engagement with said ratchet wheel in a radial direction relative to said wall for limiting rotary motion of said ratchet wheel within said chamber to one direction ; said { HEAD ~ arch block } having a predetermined transverse width dimension , and a height of { TAIL ~ teeth } on said toothed front side of said arch block being approximately equal to a height of said ratchet teeth on said ratchet wheel
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