{HEAD ~ The adjustment} may comprise a pair of {TAIL ~ guide rods} 48 on which a mount 48 for the lower roller 46 rides, with adjustable spring biasing means 49 
{ HEAD ~ The adjustment } may comprise a pair of { TAIL ~ guide rods } 48 on which a mount 48 for the lower roller 46 rides , with adjustable spring biasing means 49
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH 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