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shimano crank arm bolt
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.
frank9755-
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
Generally known as a shimano crank arm bolt I think. the originals are plastic, but ebay has a range of alu ones. https://www.ebay.co.uk/b/shimano-crank-bolt/bn_7024943602
The sizing is odd - they come in 15,18 and 20mm flavours, so you need to do some measuring to work out what will work for your cranks.
Caution - I had some ali-express knock off shimano like mountain bike cranks that apparently use a strange bolt between the 18 and 20mm options. i bought both, but neither fit and the only way is apparently asking an ali-express seller to send you one. My cranks have just gone deep into the parts bin instead.