The adjustable ring 1 additionally comprising {HEAD ~ means} for biasing said linkage means in a predetermined position to normally maintain {TAIL ~ said adjustable ring} in a contracted condition 
The adjustable ring 1 additionally comprising { HEAD ~ means } for biasing said linkage means in a predetermined position to normally maintain { TAIL ~ said adjustable ring } in a contracted condition
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH