I mentioned this in another thread, but here goes again…
As far as the draft hole meeting the chamber, centered and and just above or removing some material from the floor of the chamber is optimal in my opinion. Most other pipe makers drill their bent pipes this way.
I have seen Peterson’s with the hole drilled high above the floor and at or near the floor with no apparent consistency. They generally are more near the floor. But if it’s even quite high they seem to get through the QC process.
The problem with that is that in the final 1/3rd of the bowl the tobacco towards the rear of the bowl will burn, but the tobacco near the front of the bowl remains unburned.
I have a Deluxe 2s that I recently built up the floor on because the draft was too high up in the chamber. Probably because of a prior owner’s fascination with reaming the bowl when it wasn’t necessary.
When I redrilled the draft (at 1/8”) I came in below the floor a bit. I sanded the floor down to meet the draft, but left it a little below the floor so there would be sufficient material on the back wall of the chamber to keep it from breaking out. The draft is mostly centered between the front and back of the bowl, and I can smoke it all the way down to a few remaining strands of tobacco with absolutely no gurgle…
I have accomplished repairs like this to a number of old estates and never had any issues.
View attachment 91065