Logitech G shifter threaded adapter and shift knob

I have a red billetworks shifter and reverse lockout on my IRL car, so I figured why not replicate it for my PC.

Modelled off the IRL one, I've made two versions one with bulging piston rings and one with cutouts, the reason being that the real ones come with cutouts and I added some plumbing sealing rings to it, the black and red contrast just works with my car's OEM black and read interior, and they add a little grip, so if you have any lying around you can put them on the piston without and see what I mean, or print the one with rings like I did and do the old colour change macro thing.

I've given 0.1 mm of clearance with the faces of the thread, but that is all faces, plus the circumference comes in to it, so it was a good tolerance for my printer, if you have any dramas let me know, I can add extra clearance.

Uploaded the thread adapter step files too, so you can go to town making your own knobs.  The thread has a sacrificial layer for the hole, so poke that out before installing.