There are pros and cons to rigging your tube fly hook to break off to save the tube fly. The pro is you save the tube fly. The con is you must rig a weaker leader knot to the hook to have it break off when snagged. Knowing this, I usually still rig for my tube fly hook to break off when snagged to try to keep the tube fly. I just play the fish with a little bit more caution and finesse. It is similar to HauntedByWaters rigging.
The tube fly rigging for the hook to break off is as follows:
1" - 1 1/2" of 3/32" K&S alum. or copper tubing (K&S Tubing Cutter #296, tie the fly on the metal tube first, no liner tubing yet)
1/16" HMH Micro Liner tubing (add the brass cone/bead, sharpie color to match the fly color, melt front with a lighter, insert into the finished metal tube fly, leave the rear 1/8" longer for the junction tubing to be added, don't melt the rear)
1" - 1 1/2" of 3/32" Canadian Tube Wiggle black junction tubing (cut to the same length as the metal tube fly length, slide onto the 1/8" exposed rear liner tubing)
You can also change to different size brass cones/beads with this tube fly rigging, just as long as they fit onto the liner tubing. Take the junction tubing off, slide out the liner tubing, change to a different size brass cone/bead and put the tube fly back together.
The leader rigging for the hook to break off is as follows:
10lb. - 15lb. Maxima UG
#4, #2, #1 Owner Mosquito (black light wire hooks, may bend out on snags also)
With the main leader tie a 2 turn Improved Clinch knot to the hook eye and leave a 1/8" tag. A four turn Improved Clinch knot tends to be too strong sometimes, but if more strength is desired use 3 turns.
Then take a 6" piece of 8lb. Maxima UG and tie a 3 turn Uni Float Stop knot on the main leader above the hook, tighten using saliva, to not burn the main leader and leave 1/8" tags. Adjust the distance between the hook eye and the Uni Float Stop knot, to the length of junction tubing being used. Pull the Uni Float Stop knot into the junction tubing to butt up against the end of the liner tubing and the hook eye just inside the back edge of the junction tubing.
The 2 turn Improved Clinch knot will usually fail/break off when snagged, leaving the Uni Float Stop knot still on the leader with the tube fly.
GG