I don't understand this thread. I can only see 24tpi cups. The R20 has 26tpi cups. That is the reason that people have them re-taped to 24tpi (which is the current, easily available size).

The second point is that the R20 BB width is more like 74mm. So I don't see how this is a solution at all. Mountain bike axles are typically 73mm which is closer.

I used a "7N" Specialized axle I got from eBay. I reused the original cups, and cut about 2mm of the side of the bb shell with a hacksaw. Looks like it will work, but it's still a work-in-progress.