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Congrats on expecting! First?
Thank you! Yeah it's our first. Pretty exciting!!!
I have a Solidworks file for it somewhere but the file I have is outdated. The fab shop that was making them for me had a more recent file. There were some changes made to it for easier production. If someone wants to start remaking these or get a group buy together you can get in touch with Justin Jordan at JR Fabrication in New Portland, Maine, USA. (If you do contact them, my name is Mark Smith, not RufusTheDufus.) Justin could likely run a batch of 10 or 12 depending on what bar stock he has on hand. He would produce the machined portion of the adapter. I would tap the threads in both ends manually and also affix the .100" thick brass washer to the tip with JB weld or another suitable epoxy. I still have some of the brass washers and 400 psi Schrader valves I could donate to the cause.
I essentially copied the dimensions of a 13BT injector with a hole drilled through the center of it. There was a bit of a challenge selecting the drill size for the hole. That was determined by the fab shop. I wanted the internal volume to be as small as possible to limit the impact on the compression readings. It's a fairly long/deep hole to drill so it couldn't be too small or the bit would snap. I don't recall the size. The old website still exists on archive.org. this info and this info might help. I used the stock rubber gasket from the injector with my adapter. I didn't supply this gasket, you would have to use the one from the injector you would remove to do the compression test.
I would be in if you are going to do a run.
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