But I still think you should have single pointed it, just for the practice, of course
. Are you going to heat treat the O1, or just leave it as machined? And if so, what's your process? I have some O1 on hand I'm using for various parts, it machines pretty nicely. But I haven't tried hardening/heat treating any of it yet.
Re: split dies, sorry, no such luck. I have a Sears Craftsman tap and die set I bought about 30 years ago, I've only lost/broken a couple of taps over the years. Not the best, but it's done what I've needed it to do for a very long time, and it's standard and metric through 1/2"/12mm, so it covers a lot of ground. Later.