A resilient member 27 is engaged with the projections 26 at the lower end of the casing 23 for steadying {HEAD ~ the motion} of {TAIL ~ the oscillating arm} 24 
A resilient member 27 is engaged with the projections 26 at the lower end of the casing 23 for steadying { HEAD ~ the motion } of { TAIL ~ the oscillating arm } 24
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH