SDH and Fly tyer
Tubes I use:
5/32 copper and aluminum tubes that are avail in any hobby shop that carries K&S metal tubes. They are 12" long and run at about $1 each. I then line these with 1/8 ID black automotive air brake line. It is about 20 cents a foot.
I use the metal tubes if I need the weight to get the fly down, otherwise the air brake tubing is fine on its own...and a lot less work than making metal tubes.
Line the metal tube with the air brake tubing, and leave the front end of the air brake liner about 1/16th of an inch longer than the metal tube. Heat the air brake liner tube carefully with a lighter and the result will be a beautifully rolled back lip that rivals factory made tubes.
I leave the rear portion of the liner tube about 1/4 " long and roll the end back with a lighter, this creates a bit of a barb for the hook holder or junction tube.
I then take a short piece of medical IV tubing and slip this over the rear of the liner and bind it down onto the liner tube, with tying thread.
No need to give up your Barracuda....I have found one of the cheapest and best holding tube flie mandrels are as follows
Go to a bicycle shop and ask to see a selection of wheel spokes. Pick the ones that will slip inside your tube material.
The spoke has a nut like nipple on the end of it. This is used to tighten it into the wheel. The nipple is key to the success of the mandrel.
Cut the spoke to the desired tube length.( cut the end opposite the nipple nut) make a hook like bend in the cut end, this is held in you vise jaws, just like an ordinary hook. Now undo the nipple nut and slip on the tube material. Re attach the nipple nut and tighten in down until it makes contact with the tube material. The nipple nut has a nice taper to the leading edge and it will act like a wedge in holding the tube tight, keeping it from rotating when applying your thread and fly materials.
Seriously, this is one of the best tube fly vise adaptors you will find....I am actually thinking of marketing this need little version.
Try it out....it will end up costing you about $6 for half a dozen assorted length mandrels.
Tight Lines and Screaming Reels!!!