The answer is sin(3 degrees) x the distance between the mounting bolts.

For my UCD 60 the bolts are 1 7/8" apart and the thickness is .098".

Metric is easier 47.6 mm distance between bolts yields 2.5 mm thickness.

Sin(3 degrees) is 0.052335956.


Leonard


PS I haven't done trig in years, but I a pretty sure this is right.