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Hi Andy,
In Melbourne, perhaps you could try Siderial Trading for service /repair work. I'm not 100% sure, but seem to recall someone recommending them for such work.
One thing to check is that the correct effective diameter (#teeth & teeth size) pulleys have been installed when the belt mod was done as that could definitely alter tracking accuracy, which you seem to be suffering from. You could simply check over a long time period through what angle the RA axis rotates. It should rotate 360 degrees in 24 hours or 15 degreed per hour. It it doesn't then there's an issue.
Good luck in the hunt and BTW, given that's your first post ...... Welcome to the forum.
Best
JA
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