[Fot] O-ring for TR3a "B" style calipers

[Jason Sukey]

Does anyone have experience with the square o-ring needed for TR3A split
calipers ("B" style with bolt down pad retainers)?

The seal recess in these measures 9/16" diameter, compared to the later 16P
calipers that have a 1/2" diameter seal recess.

The o-rings I just received from Moss (583-821) measure 1/2", same as the
seals for the 16P calipers.  Moss is at least looking into it, but they
don't have any more on the shelf to check.

Does anyone know of a source for these?

Jason
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