I've been looking for a drive plug for my Snap-on 5/8" female rat; thought I had one, but was outbid at the last minute/second.
But today it seemed that my problem was solved--with a bonus. At a poorly-lit estate sale this am, I spied a Blackhawk big boy with a drive plug for the princely sum of $8.00. And it clicked smoothly--at least as smoothly as one of those can click. Oh, heaven, can such things be! Grabbed it up quick as can be.
When I got home, I found that it was not exactly what I had thought. (Some of you can see where I'm going here.) It's a No. 916N pat pend. But it's a 7/8"
So.... I'm both disappointed and happy as can be. Now I know what to do with my 3/4" socket/doorstops.