3M 21639, PSA Cloth Disc 348D, 36 X-weight, 6 in x NH, Die 600Z, 7000148149 
Insize 4905-160, BLOCK LEVEL, 6″, 6928640324932
$692.37
Sensitivity .00024in/ft (=0.001?)
No need to set zero before use.
V-groove on bottom for shafts (shafts diameter .76~4.56″).
With longitudinal vial.
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