Hey Ben,

I don't mootch much, but when I do, I prefer the "slido" tubes and a round weight that clips into the snap swivel on the slido... change the weights in a snap, and you never get a weight back that is half-clipped on like those other ones.

As far as other tubes, try a fly fishing shop, they sell small hard tube about the same size for tying saltwater tube flies on... they sell it in a 2' or 3' length usually... pretty cheap, too.

-N.