Found em.It was Mr. Nervoustrigger himself, if you want to know the latest on QBs, check out his posts.
For the stem, I typically knock out the OEM stem and reuse it. Keeps me from having to buy various diameters of O1 drill rod and having to harden it.
I thought about using the old rod but If I start making poppets to experiment with I might buy that drill rod mackerel5 recommends. But how do you use the brass tube to "bush down the valve"? I'm missing something. Guess I need to do more reading.
I did mine the easy way, Jason built mine. 😀 Fantastic shooting gun.