I'd be interested in both 6mm and 8mm.
this seems like something which could be done fairly easily and perhaps affordable with 3D printing.
I guess I was thinking that if the metal ones haven't been made in years, and the plastic ones are affordable, you don't need to swap them out, you just now have replacements. And depending upon price point, while you wouldn't be looking to destroy them, by any mean, they might fall more into the category of hey, if it happens, it happens. (My favorite category.)Probably, if made upside-down so the threaded hole could be built up in layers. You can probably get gray plastic for a decent match to the chrome stand, but is it as resilient as the metal version? My metal ones don't get babied on tour, and surprisingly I've had no breakage. I would be hesitant to swap them for plastic.