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It's something I have machinists make for me. It's full #tartmode on both effort and expense, but it's very light and very reliable. The first ones had more bond area, but the one in the picture has been in my Look 585 for over a decade with no issues, and there's a similar one in my T3 which has been there very nearly as long.
This seemed like a good idea (secure, adjustable, idiot proof) but Easton quit the fork market and I've not seen anybody else steal the idea
https://www.youtube.com/watch?v=zewX15b-wEo
ETA: Internal threads seem to be a thing in BMX