Bin it.

maybe try getting some aloy pipe and sticking it inside with some glue and then maybe some fiber glass or some hard **** to hold it together

Get a hydrodynamic aluminium boom at 1/3 of the cost of a carbon boom I have been using these booms for over 15 years now and they hold up at gear munching scarborough. They're tough, well priced and easy to get spare parts for if you ever need too.

Cut a piece off the extension - about 6 inches - will have to sand it down so that it fits in either side of the break - once it fits in fairly snugglely,pull it out and then apply glue all over and put it back in.

Worked a treat for a very newish carbon boom we had and has lasted 2 full on seasons and still working fine

Means your boom has a shorter range of extension but at least you still have a great boom - or possiblely scrounge around for a old carbon extension and then keep your full range of extension

tough break on that one, bot if it is on the straight section just use the extension tip, deffinetly a good way to go and saves you a few hundred bucks. still even better if you have a carbon kite bar, what beter use for it then to save a boom? well hope you getting the breeze and swell which were getting in syd cause it's been pretty awesome the last coupla days, flat rock must be going off by now.

have a good one,
poley.

the threat of local police is always a good reason to stay clear of lismore, you say one remark and... Also i had to start working again and blah blah blah. so now i'm totally screwed and doing a stupid degree called engineering, i don't recommend it if anyone is thinking that way. but i was passing through not to long ago and there were way to many kiters and i think one board out all very dissapointing. the shop has a NP 200-245 $400 but unless it's for your flat water rig i wouldn't trust it as its a race boom.