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