{HEAD ~ Shim means} are provided to adjust {TAIL ~ the vertical clearance} between the throat and the gate and horizontal clearance between the gate and the guide member 
are provided to adjust
{ HEAD ~ Shim means } are provided to adjust { TAIL ~ the vertical clearance } between the throat and the gate and horizontal clearance between the gate and the guide member
HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH