The thing is that this piece of bamboo only is 6 mm (0,236 inches) thick between the knuckles, and I usually drill my airway to 4 mm (0,157 inches). That means that the walls of the bamboo when drilled will only be 1 mm on either side, which doesn't leave any room for the mortises into which the tubing would fit.
Any suggestions on how to use this piece or is it simply to small? I think I remember seeing some pipes with very small bamboo shanks though, so I guess there's some way, but I dunno.

Thanks,
/Albert