No, not drilled to button. That would make the button uncomfortable to clench for me. I want my button to thin as shit, with a reasonable amount of material above and below the slot.
Also, keep in mind that my stanies are rather old.
I’m not schooled enough in air flow dynamics to argue with you. But, something I do notice in all of my pipes is that the opening into the chamber is always less than the diameter of the draft in the shank of the stummel. And, the draft in the stem tapers to just before the button and then the funnel of the slot widens.
My very first pipe I made, and I am not saying that I am a great pipemaker now) but my very first pipe I drilled at whatever pimo sells as the largest bit, and it smokes like a wide open corncob. I hate it.
I have a Colding Danish pipe that has like a 2mm draft (apprx). Barely get a pipe cleaner through it, and it smokes as well as a Dunhill.
I think that there’s more to draft hole logic than just the diameter. That’s just me. And, I’m just a guy whole loves pipes. Big pipes, little pipes, wide pipes, long pipes, pipes pipes pipes.I declare that pipemakers know more than me. And, this is where I plant my flag. For better or worse.