The roller frame assembly includes {HEAD ~ at least one idler wheel} and {TAIL ~ a number} of guide rollers 
The roller frame assembly includes { HEAD ~ at least one idler wheel } and { TAIL ~ a number } of guide rollers
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH