so the top section of my mast split today, from the join and goes up about 2cm. What's the best option, cut the split bit off? There seems to be some reinforcement around the bottom cm so I would lose that Or wrap some glass around it and leave it the same length.

what I've done as a quick fix to keep sailing was a found a piece of pvc pipe about 2cm long and exactly right diameter and used it as a sleeve. Thinking this might work permanently as it was such I tight fit I may not be able to get it off.