Interesting name....You've got a lathe now so just make some.
It was the first job I did when I got my Boxford.
Same problem and I was able to get some grub screws the correct size and used a parting blade to cut the slots.
Still works years later.
Just did a search and I see I posted on it, so link below.
Lathe
The glanze tools ? Don't regret buying em. New tool post to make next for me. Yep that's the oneswww.mig-welding.co.uk