Okay, how about iron age retro?
I have an abacus, if you don't know what one is it's a tool that's useful for representing numerical data before paper and electricity were used. Mine has a frame with with 9 rows of beads. There's a bar that separates the upper beads (worth 5, 50, 500, etc) from the lower (worth 1, 10, etc)
It's a "Chinese" abacus containing 5 lower beads and 2 upper beads per row. The Japanese improved the design a long time ago, because they always improve stuff only this time tentacles were not involved. A "Japanese" abacus has 4 lower beads and 1 upper bead per row.
Story is, after about a decade and a half of not bothering to learn how to use it I decided to learn how to use it....but the "Japanese" style Abacus is now pretty much considered the standard, and me with my "Chinese" style abacus were out of date by a century or two (maybe more). When learning how to use one, it helps to have the same kind of abacus as the person in the videos....so rather than taking the easy route and buying a new one I decided to modify my abacus. Because I'm one of those people that refuses to buy something if I can do it/make it myself.
I know nothing of wood working, the cheap abacus from 15+ years ago was not made to be taken apart. Taking off one bead per row sounds simple, but it wasn't because holding everything in place was a bit weird(many profanities were exclaimed). I used a saw from my trusty pocket knife, which I never used before, even when a boy scout, and cut the Abacus apart and removed the extra beads.
Now the hard part was putting the damned thing back together and making it stay together. So naturally duct tape and super glue were to be used because I'm an amateur. So I had to glue the rows back in and keep them in while I glued the frame back together, and put on a layer of duct tape.
Then it hit me....I had nothing to brace the Abacus while it was drying,
Quickly thinking I grabbed a rubber band and managed to use that as a makeshift brace. Surprisingly it worked, I then put a layer of super glue and yet another layer of duct tape on to keep it secure and let it dry.
It looks like a highly intelligent redneck device now (a contradiction, this device has no business existing). But it works and that's what matters.