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Side note as I can't answer the question, but I'd really like a paper wheel setup like that but can't find any slow/medium speed grinders in the UK...  If anyone knows a source apart from $150 shipping charges from US I'd be grateful...  B

Look for the Drechselmeister slow speed bench grinder (DML-200N). They sell it around Europe, however not widely available. It is sold both with and without a CBN wheel. Look for the one without, since you're going to use it with paper wheels anyway. It has a 16mm bore (5/8 inch).
There is also a version with dual speed (1480/2850 rpm), called Drechselmeister DUO 200.

Be aware that it's delivered with 40mm thick grinding wheels, so if you use 10 by 1 inch paper wheels, you have to use a spacer between the flange and the nut. I use a couple of washers for now.
I've just started using mine, but it seems to be well built.

https://dehoutdraaierij.nl/en/shop/grinding/grinding-machine-with-cbn-wheel-copy/
https://www.drechselbedarf-schulte.de/drechselwerkzeuge/schaerfsysteme/ks-dml-200n-doppelschleifer/3993/ks-dml-200n-doppelschleifer-langsamlaeufer-200-x-40-mm
https://www.woodcarvingtools.org/sharpening/slow-speed-bench-grinders/1625/drechselmeister-slow-speed-bench-grinder
https://www.willyvanhoutte.com/EN/products/bench-grinders/2831

Axminster also sells a slow speed grinder, but it has 18mm bore.

Thanks, Jan. I'll have a look your spreadsheet.
Right now I'm trying out the "TormekCalc" spreadsheet by 'jvh', and it seems to work great.

I couldn't find square tubing or aluminium block in the right size, so I decided to try clamping the legs directly to the XB-100.

I found these "12mm linear rail shaft support" on AliExpress:
https://www.aliexpress.com/item/32336816419.html

Drilled and tapped four M5 holes in the XB-100 and screwed the clamps in place.

Used a "12x300 linear shaft" in one of the clamps and a threaded bar from a local store in the other:
https://www.aliexpress.com/item/32336820800.html

Time will tell if it's solid enough 

Thank you for your answer, Rick.
You're correct, it's the same thing that happends to yours, the legs runs into the body of the Tormek. I guess if it ever becomes a problem I could allways mount a stop collar or a nut to give the FVB a stopping point before the legs hit the body.

Does the Universal Support have the need to go all the way down when the FVB is in the inserted position?
My home made FVB is so shallow the Universal Support hits the Tormek housing about half way down.