If you want to buy from a UK supplier then Bruce (polly) engineering do them page 35 of the pdf catalogue or you can get a larger range from GHW or Knupfer in Germany.
These are 1 size smaller hex than standard so look about right on a model, I use them on all my own design models and tend to get them from GHW, my stock
![20211005_155957[1].jpg 20211005_155957[1].jpg](data:image/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==)
Edited By JasonB on 05/10/2021 16:09:21
Edited By JasonB on 05/10/2021 16:11:24