Pretty sure all the [single nut] Pro-Arm hubs are the same ID. I don't recall needing to draw up different HRC-style conversion parts for any of them... one size fits all, as they say!

I think RC30, RC45, NC30, NC35, and MC28 are all the same. (The all differ in width though, of course!)
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Andy.
NSR-WORLD.COM

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