Hello,
what do you think about radius milling cutters for drilling the tobacco chamber? I just bought one (20 mm = 0.8") at ebay and the first attempts on birch blocks are looking quiet good, I think...
I'm not sure, if the ground of the tobacco chamber should be a symetric radius - often drill bits for this work look more oval, but all the reamer I know are also symetric tools.
Greetings,
Heinz