Nice setup Dan. I made mine with the same concept except I used PVC. No caps on mine. I like yours better. I handle mine with extreme care cause I know one of these days I will dump it. Gonna have to check sloans out and get better tubes.
Hey YB they have caps to fit all sizes of PVC and they friction fit pretty well, the nice thing is you can write on the PVC with a magic marker. One 20' stick of 1/2" PVC would cut up to about 40 six inch tubes, you could probably save up a bunch of wine corks as stoppers, the new plastic or the old fashioned cork.
(Won't work if you use boxed wine or the cheap stuff with screw caps, like someone who shall remain nameless but his initials are GrayBeard.)
You could probably find a dowl rod that would fit as well. Lots of alternatives.
No worries about breaking fragile glass tubes either!
I'm going to have to make one of these too before long.
Sorry GB I just couldn't control myself.
Gabby