That's clever!
Today I spent most of the day making a t nut and rider block for a friend's Sheldon 11 lathe. Would have been easy but for a) the compound having been broken and badly repaired, so the slot was asymmetric and tilted and b) me grabbing what must have been a piece of tool steel from my scrap drawer.
Problem a) resulted in lots of trial and error, but we ended up getting a good fit.
Problem b) resulted in a dull bandsaw band, a used up angle grinder disk, a chipped carbide endmill and a chipped tap. I even had to chamfer the edges with a Dremel as my files would barely cut it! Oh and a dull drill bit, had to use a #3 carbide drill to finish the first tap hole!
T nut from hell
With riser block installed
With his old oxa tool post (from my old Atlas 618 that I sold him a couple of years ago!) Installed in one of three positions
Left over piece of mystery scrap from hell, with warning sign
He'll get an AXA sized tool post when he frees up some funds selling his (my!) old lathe