I made mine several years ago and couldn't remember where I'd found the plan for them. I thought it might be an old issue of ME, but I have so many of those scattered in different boxes that I figured it would take forever to look through and find again. So I was planning to just copy the one I have.
Thinking about the possibility of cutters at both ends of the slot, but without having two jack screws or flipping the tool holder, I remembered another old series of articles in ME about a kind of sub-tool holder. this was a small block that held a lathe tool at an angle, and itself was placed in a larger tool holder, but square t that one. You set the tool at a consistent height inside the smaller toolholder block -- at least that's how I remember it. Then it was always at the correct height in the larger.
I tried to do a search for that ME issue reference, and failed, but accidentally turned up the plan to my own tool holder. Great! Now I don't have to reverse engineer something I made myself!
Here is the link -- the original article and design was by L.C. Mason in Jan 2, 1970 ME.
http://steammachine.com/hercus/page6.htmlI see I did an even simpler (cruder) version of it without any of the nice reliefs -- but back then I didn't own a mill.
Now if anybody knows what issue the other unusual tool holders articles were in, I'd greatly appreciate re-reading them. I'm sure I have the mags -- just don't recall what the tool holders were called or the author's name, so I can't locate the issue.