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I will just be tapping by hand, carefully. I hadn't heard of forming taps until I was searching the net to try and find out which type of thread standard I should use. It did occur to me that the...

Thanks,
I will tapping four holes in aluminium. I will grab that one you have linked, but will need the 1st tap and a bottoming tap too.

Thanks No.3. The tapping lube and kero is a good tip too. Sorry if this is a dumb question but is this tap the correct thread with a different nomenclature?
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I just bought some of these

https://reloadingdirect.co.nz/shop/gunsmithing/screws-hardware/assorted-gun-screws-torx-head/

GunScrewsTorxHead-8-40 x 1/4" T15 Fillister


Some of the more...