On Thu, 18 Jun 2020 07:50:28 -0700 (PDT), wws
wrote:

On Thursday, June 18, 2020 at 6:09:37 AM UTC-5, maxq wrote:
I'm making a special tool out of a 3/8 drive socket. It'll have to be
turned by a wrench or gripped by vise jaws. I'll file flats on the
square end.

Should the flats be parallel with the square's sides, or have the point
in the middle? This is a high-torque situation.

I'm not smart enough to reinvent the wheel:

https://www.harborfreight.com/3-piec...aps-67011.html
I'm not either, at that price