@Summer not dense at all.
Here's 3 pieces which show the principal of my design.
Condenser showing at both ends, full length to isolate the vapor path from the outer body.
Here are the component parts before assembly, the condenser has a fine male thread on it. The Blackwood and acrylic are both female threaded. The parts all get screwed together then turned as one.
With this stem the condenser is two pieces of tube, the Blackwood pieces are threaded.
And here is
@Baron23's piece he won in a give away I did with Mom.
There is no way my 2mm drill will make contact on top of the 5mm tube without slipping down the side which will ruin the outer material.
I tried a slot drill, an engineering type cutter but my drill press has too much play in it to allow them to work.
However since you asked I had an idea which may work, I'll make one and post the details of how I go about it.
Reclaim is the condensed vapor which coats the vapor path in vapes. People reclaim it.
Hope this helps.
@Mr. Me2 here's the burr I mentioned, I like the natural edge on the rear and the way the 90 degree cut in the burr looks.