I would go with J-B Weld, get the industrial stuff if you can, the consumer ones tend to sit on the shelf for a while and it's potency can go down a bit. If you are looking to replace it with fiberglass or carbon fiber, any kite making or repair shop will have the correct diameter tubing, plus the resin to bond it to steel, they can bend it, cut it, almost weld it. I have a 19 foot wide delta kite with a 100 foot tail, shafts are 3/4" and break quite easily with a strong gust of wind, BUT that strong gust for me is about 500 pounds of forece on the stick. Try the J-B Weld, you can always lop a little more off with a dremel if you have to. In any case, when any epoxy is curing, take care to put a fan on it or the vapors in rare cases have done damage to electronics. Good luck with it, HH!
Bri-