a pair of {HEAD ~ springs} provided on {TAIL ~ the base} means in an upright position for pushing the rotatable frame at two points in the bottom surface thereof nearly under the pair of the bearings which support the follower roller; and 
provided on
a pair of { HEAD ~ springs } provided on { TAIL ~ the base } means in an upright position for pushing the rotatable frame at two points in the bottom surface thereof nearly under the pair of the bearings which support the follower roller ; and
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH