Thanks Jeff! I'll fill the room between hull and strip so it won't eat main sheets. Even new bolts got damaged when put them in, so I put a threadtap? in. Don't know or that was the right decision. On some of them the thread now feels a little 'weak'. Do you know how the internal construction is? Just a laminated bolt? Or a connecting strip?

Sailed her this weekend and she put a big grin on my face!

Had some problems with unhooking the main. The first time the knot was too big. With a small knot the ring can be pulled high enough. But if the mast is turned the ring doesn't flip off. Any tips or tricks?

Does anyone know or and how the roller balls of the mainsheet traveller can be replaced? They feel quite square.

Has anyone tried the 'firebird orion' (see youtube) righting method on a nacra? On bigger cats the mast foot is mostly locked on the ball. I can image the mast foot would come loose on a nacra?

@Jeff: An almost new main would be nice as the current main is quite old. But for this summer I think I better can spend my money on more essential improvements. But I'll keep it in mind!