The jig I first made was a very simple, cross your fingers and hope you got it right kind of jig. NO adjust-ability. I’ll use for my first box, a Hoppes gun cleaning kit, that I want to change from its OEM cheap plastic to wooden.

My next project will be the above “micro-adjustable” jig, once I get to WC and/or HD and pick up the needed bolts, inserts, and knobs.

Here is the simple jig. You can see where I had to attempt it twice (by the cuts). Not very substantial and will not last long IMO, but will work for now:

HorizontalMike