The spring of the clutch 68 may then be manually retensioned by {HEAD ~ suitable means} which extends to the exterior of {TAIL ~ the apparatus} 10 
The spring of the clutch 68 may then be manually retensioned by { HEAD ~ suitable means } which extends to the exterior of { TAIL ~ the apparatus } 10
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH