I have included a photo of the serial plate if it helps.
Thank you ChaiLatte. Much appreciated. I tried looking for the manual, but my searching skills aren't as good as yours.It doesn't.
Have you looked for a manual for the machine?
http://vintagemachinery.org/pubs/detail.aspx?id=27829
Part number is 27, on page 2 of the manual. 1/2" BSF.
Proper knurled nuts in that obsolete thread will be next to impossible to source. Standard 1/2" BSF nuts are easy to source.
If you want knurled nuts, buy two of these:
https://www.gwr-fasteners.co.uk/m10-knurled-thumb-nuts-thin-type-din-467---brass-101563-p.asp
an 11.2mm drill bit (in brass an 11mm drill bit would be OK) and a 1/2" BSF taper tap.
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