I'm making a Hexamid Twin (pieces and guidance from Joe Valesko), and I'll be using a modified GG LT4 and a 32", 0.420" diameter carbon tube from Josh Leavitt for the poles. I wanted to be able to connect the two poles to make a 7-foot long fishing pole.
I removed the plastic tip from the LT4 and installed a female threaded aluminum fitting and a male threaded aluminum point. I did the same for both ends of the carbon tube that serves as the shorter pole for the hexamid. I then made an aluminum connector with two male ends that can connect the threaded female ends of the LT4 and the small pole, and a composite sleeve to go over the joint (to bear the bending load and protect the connector).
The composite sleeve was an experiment. I decided to try a hand layup because I couldn't find any carbon or aluminum tubing in just the right diameter. The materials I had in the garage were Vectran tow, 1 oz basalt woven fabric, basalt fiber tow, and Loctite EH60 epoxy. So I saturated a rectangle of the basalt fabric, some Vectran tow, and some basalt fiber tow with the epoxy. I then rolled the fabric around an aluminum tubing mandrel (with silicone mold release), I wound the vectran around the basalt fabric, and I wound some basalt fiber tow around the ends. I then wrapped LDPE film tightly around the layup, and put it in a warm place overnight. The next day, I had a fabric wrapped and filament wound Basalt/Vectran tube to go over the pole joint. It is very rigid (I don't think I could break it with my hands), and weighs 0.12 oz.
Both poles, with the connector, weigh 3.15 ounces. I plan to add a couple of pegs/hooks to the side of the LT4 for hand reeling, and a short aluminum tube to the end to serve as a spool for casting. I hope to keep the entire weight penalty of my fishing tools under 2 ounces (because the poles are already a component of the tent). Any ideas or feedback are welcome.