{HEAD ~ The force} of the tumbler spring then pivots {TAIL ~ the tumbler} into its assembled position where the detent is engaged with the retaining ledge 
pivots
{ HEAD ~ The force } of the tumbler spring then pivots { TAIL ~ the tumbler } into its assembled position where the detent is engaged with the retaining ledge
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH