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Good luck. I recall now the old pomps did come standard with an on one external track crank - they don't exist anymore, but you could ping planet x an email to see if they remember the size too.
As a bodge, I've used a diy clamp thing to provide an approximate level of bearing preload, and then just done the pinch bolts up good and tight.
I don't think the big bolt is ever intended to provide resistance to a crank falling off, as the plastic one will fail pretty quick.
Scrabble-
If you are looking for a replacement for the on-one crank i bought this: https://it.aliexpress.com/item/32700975019.html?spm=a2g0s.9042311.0.0.27424c4d8vfSo0 it's a different size from the shimano ones and i straggled a bit to find the right replacement
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I just "estimated" the pre-load by leaning the bike on the ground with the drive side down to push the axle through, and held the non-drive crank on firmly. I think I erred on the side of going too tight so that it was less likely to come off half a dozen times before I got home!
Matita24
frank9755
Thanks, I never thought of actually just trying a Shimano one to see if it fits! That's the first thing to do. Then I can measure if it doesn't fit and hit ebay.
That link gives me an error, BTW, but I get the idea.