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Thanks Troy. It was a combination of a high spot due to paint overspray and the set screws not being tightened down on to the RA shaft. I would never have found this without pulling it apart. The QC on these mounts is interesting - the machining is generally quite good however they leave paint in places where it really shouldn't be and fail to tighten set screws. I found this also in the altitude mechanism where one of the three set screws was not touching the pressure plate and the other two were really tight.
Today I'm going to check for burs and high points, install the main bearings in their housings and do the spacer measurements.
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