The intermediate member is in {HEAD ~ turn} coupled by an additional plurality of sprag levers to a fixed member having internal clutch teeth to prevent the intermediate member from retrograde movement when it is not being advanced {TAIL ~ The intermediate lever member} is splined to a coupling member, and the coupling member is in turn splined to a turning member for connection to an adjusting shaft 
The intermediate member is in { HEAD ~ turn } coupled by an additional plurality of sprag levers to a fixed member having internal clutch teeth to prevent the intermediate member from retrograde movement when it is not being advanced { TAIL ~ The intermediate lever member } is splined to a coupling member , and the coupling member is in turn splined to a turning member for connection to an adjusting shaft
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