Micro Seiki CF-1 hole diameter

I can't find this diameter neither in manual or anywhere else. Trying to figure out if it will fit the rega 23mm hole. Do you guys know?
Malammik, I don't think it will fit without enlarging the hole. If you look in the CF-1 manual from Vinyl Engine, under the category Tonearm Installation,
it clearly says:

After setting the tonearm position, drill a 28 mm diameter hole for the tonearm base.

I hope this helps.