The toothed arch block 12 is mounted in the smoothly arched notch 101 inside the box end 10 and forced or biased by {HEAD ~ the spring} 12 into {TAIL ~ engagement} with the ratchet wheel 11 to limit the rotary motion of the ratchet wheel 11 in the box end 10 of the wrench 1 in one direction 
into
The toothed arch block 12 is mounted in the smoothly arched notch 101 inside the box end 10 and forced or biased by { HEAD ~ the spring } 12 into { TAIL ~ engagement } with the ratchet wheel 11 to limit the rotary motion of the ratchet wheel 11 in the box end 10 of the wrench 1 in one direction
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