You two are talking about two different tube fly related issues. Both are cool and fun, but they are different.
Paul, Hunter's angling now sells drilled out cones that fit either narrow or large (1/8th inch) tubing, so you can tie the "russian bullet" type flies that same guy talks about easily.
Another thing I've been experimenting with is leaving an eigth inch extension on the front of all my tube flies, and carrying a variety of weighted lead eyes tied to short sections of junction tubing. Just slip the one you want onto the fly you want if you need a little help getting down. Junction is available in clear, chartreuse, pink, orange, red, so I also have unweighted sections in the box. Egg sucking weighted or unweighted flies in a second.
It's all so much fun, gotta make time for fishing!