The first and second surfaces are dimensioned such that rotation of {HEAD ~ the member} about the axis in the first direction causes one of the elements to be wound onto {TAIL ~ its respective surface} as the other element is unwound from the its respective surface top vary the force moments about the axis, to render the biasing force on the load generally more uniform 
The first and second surfaces are dimensioned such that rotation of { HEAD ~ the member } about the axis in the first direction causes one of the elements to be wound onto { TAIL ~ its respective surface } as the other element is unwound from the its respective surface top vary the force moments about the axis , to render the biasing force on the load generally more uniform
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 TAIL TAIL TAIL TAIL TAIL TAIL TAIL 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 OTH