I have bought a PaK 43 on the Armortek Open Day which I am building when I get some spare time. As there is a lot of castellated nuts on the model I decided to get some cast.
These will be 8BA size, if anyone is interested in purchasing some small castellated nuts please let me know before I order the amount I need. Attached is a photo of the 3mm 8PA nuts

Regards Steve,
steve.winstone@sky.com
If you need any other parts I make email me and I will send you a catalogue.