There are occasions when even most die hard carbide insert user just have to sulk and grind the (form) tool from HSS or alternative tool from a blank and raid to broken tap box does not inspire.
This one worked fine with low quality indian? HSS, but when I was grinding it, some inclusions/pores were revealed, no big deal on POM, but not very optimal when you have to grind off extra 3mm on small 1/8" blank.
Long story short, where to get decent 2-6 mm sguare HSS blanks and round small fine grain carbide blanks?
Pekka