I spent a few minutes prototyping today. I discovered that the d-pad insert is sized for an M5-0.8 screw, so I rounded up a few from my loose hardware. I filed the tops flat, then I cut one screw short (and fixed the threads). A couple pieces of heat shrink tubing conceal the threads between the d-pad and the head of the screw. I rummaged an approximately thumbstick-shaped button from the crafting supplies, sanded the back flat, and glued it to the top; it's not terrible for a first run, but there are a few things I'd do differently.
submitted by /u/tranquil_sojourner
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Source: https://www.reddit.com/r/MasterSystem/c ... humbstick/