The tool post bolt has a male M22x2.0 thread into the cross slide. Not much room to work with and while I was totally shit cutting threads on my old lathe I found that it took about an hour to understand the hieroglyphics to determine which gear set was correct for a 2mm pitch. After sorting this out I had a go at cutting the thread and discovered I am still shit. So I found a die nut and will use that instead.
Cutting threads is the hardest thing to master on a lathe I reckon, don’t loose interest.
I mangled that fork brain cartridge foot part I made with the schrader valve 5 times before I had one I was happy with. Super tricky, ~8mm OD at the end, 220mm long, hollow. Took 2-3 hours to make each one. Worst part, NFI where the good one is, after packing up and moving the lathe after my divorce, I can’t find it.
Start with 2012 Aluminium, good carbide insert tools, lube ( I like inox spray), go slow. Give yourself a dead zone after the thread, where you’ve decreased the OD. Never ever disengage the half nut. Experiment with tool height, depth of cut. It’s half back Magic. Different stock behaves differently too. This is why I only work with 2012.
Would be a bunch of good clips on YouTube.