In message , Chris
Styles writes

Are you sure it's 10mm ?

Not exactly. I dont own a pair of calipers... they would be useful for
various things though...

I measured the spare set of feet I have and they have an 11mm dia peg

I measured mine with a ruler, so i guess +/- 1mm would be about right, what
with my eyes an' all.

So, I have a set of castors and want wheels, you want the opposite

as I said, take it to email

geoff at cetltd.co.uk would be best, but the above should work
--
geoff