These days I have little time. But...............

I have another CMP factory backplate that I drilled wrong at 3/8". Slight drill wandering. If you need a larger than 3/8" hole, then its yours. But I would use a boring tool to true it up to the next larger size, if that would work for you Tell me where to send it.

Or use an insert in your current spinner and drill/bore as needed once again

Steve