The gauge also has a pair of rest bars mounted on the base plate to support {HEAD ~ the brake block} at {TAIL ~ the specified radius} at first and second measuring points 
at
The gauge also has a pair of rest bars mounted on the base plate to support { HEAD ~ the brake block } at { TAIL ~ the specified radius } at first and second measuring points
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH