Holding small things to saw pierce or azure is always difficult.
Saw a very cool tool awhile back that solves much of those problems
and I want one but can;t find one anywhere.
When I saw that tool in the video, I stopped and went to make just
such a thing.
Holding stuff when sawing and setting is sometimes tricky and I
avoid wax and jet set if I can.
I hope it comes out, but here is a picture of the first one.
5 mm square steel and drilled and tapped with 3mm screws.
The wood is from those paint mixing thingy's you buy at the hardware