Thanks for bumping this thread. Wow ... I referenced the beginning of this very conversation years ago and executed one of the core solutions presented here!
I'd purchased, new, a relatively inexpensive Bjarne Viking Copenhagen Rhodesian from one of the site sponsors listed to the left. When I first received it in the mail, three things stuck me on first inspection: 1) Wow, what a nice looking pipe this was for the price, 2) Wow, what a nice, wide, deep bowl this pipe had, and 3) Aw, dammit! The drilling is too deep, a good 3mm below the draft hole. The wood at the bottom had to be very thin, as well.
I never complained to the vendor (they're totally off the hook as far as this post is concerned; I've bought more from them since); I liked the pipe anyway. I figured between the air-pocked method I usually apply packing and some care while smoking, I might avoid burning through the bottom of the bowl.
I found this topic searching around for fill suggestions before using the pipe. Pipe mud with cigar ash I'd heard of before, but the wood ash premise sounded intriguing. I made some ash mud (cherrywood) and, after sanding out the black bowl coating, more or less sculpted a new bowl bottom to the level of the draft hole, adding 3-4mm thickness to the wood at the bottom.
I'm glad I didn't give up on this pipe. Many good bowls have been smoked, and you can't even tell I did any "work" on it. :mrgreen: