The shaft is intended to be used without the washer that sits above the pivot, and allows for 3mm LEDs as well as standard 6mm threaded balltops and bat tops to be installed. The shaft diameter above the pivot will be the same as a JLFs, but the height will be shorter. If you want to use JLF shaft covers you will have to trim a bit off for them to properly fit. There will also be a slot for a flat head screwdriver to make for a similar balltop installation as japanese sticks.
Pics of 3D model
Spoiler



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