Shameless plug, sorry,
I've had dozens of people email me in the last few years asking me when these would come back. Thanks to a lot of support from Blake @ Dos in the last year i'm psyched to announce they are back along with a whole host of exciting new products.
In the last year i've invested a few thousand out of the family checking in new tooling and equipment to bring back these parts with more sustainable supply chain, higher quality than ever, and more precise and optimized geometry. We're using new sourced cores so I won't be held up from running out, and we have a CNC lathe that lets me fine tune the combustion geometry in ways i never could before.
Thanks to everyone who has supported me over the years and encouraged me to get back in the game!