3M 14197, Roloc Disc Pad TP, Medium 2 in 1/4-20 Internal, 7000119311 
Insize 4902-6, FRAME LEVELS, 6×6″, 6928640382796
$258.21
Sensitivity .00024in/ft (=0.001?)
V-groove on bottom and left for shafts (shafts diameter .59~2.76″).
With transverse vial.
Supplied with adjusting wrench
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