I'm contemplating a modification for my bench.
The built in Moxon has some limitations, specifically in holding things
that are less than 1/2 the thickness of the front chop.
I'm examining the commercial twin screw offerings,
but have a vague memory of an involved DIY shown in FWW.
It was a long assembly that used Jorgensen 3" hold downs like the one below.
I can't find the article, so it may have been in another rag.