G-10 glass tubing this time around. Dynawind is lighter and strong enough,
but we want to use glass couplers this time around for more strength, and
that leads to fit issues with the Magnaframe-based Dynawind tubing. So even
-though it's slightly heavier, we're going with an all-gladd build this time.
+though it's slightly heavier, we're going with an all-glass build this time.
We'll lose a little bit of max velocity, but hopefully it'll all hang together
this time!