The support shaft 50 defines {HEAD ~ an elongate slot} 52 longitudinally therealong for engaging the end of {TAIL ~ a spring}, as to be described below 
The support shaft 50 defines { HEAD ~ an elongate slot } 52 longitudinally therealong for engaging the end of { TAIL ~ a spring } , as to be described below
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH