a spring provided on the base means in {HEAD ~ an upright position} for pushing the rotatable frame upward at a point near one of {TAIL ~ the pair} of the bearings which support the follower roller 
a spring provided on the base means in { HEAD ~ an upright position } for pushing the rotatable frame upward at a point near one of { TAIL ~ the pair } of the bearings which support the follower roller
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH