On Monday, 5 August 2019 21:29:28 UTC+1, Gareth's was W7 now W10 Downstairs Computer wrote:
What's the favoured approach to getting hold of gears,
to cut them yourself, or to buy from, say, HPC gears?

You are not likely to have the equipment needed to do this .
https://www.shutterstock.com/search/hobbing+cutter