Dirk.

Just pop riveting two eyestraps onto the mainbeam and shackle your blocks to them (with a spring) will definately work. That was the way all Formula boats were setup up before the selftackers came along.

I would personally try to make a jib yourself (or have it made locally) with the instructions given to you by Rolf. That is if you can get the dacron cloth there in China. After having fiddles with my own jib now I can see that it is not a big step to make. Even if the jib is not prefect first time round then you can easily alter your luff curve manually to get a better shape. It is also easy to test any new luff curve. Just take a stapler and staple a new luff round on your jib. You'll actually be stampling the tunnel through which the forestay runs (closed zipper). Once you are happy with the jib after making a few tries then you can have the new curve sewn into the sock permanently.

All in all it is a pretty low cost-low risk operation. And the construction of the jib itself is not really that difficult. You can probably steal some of the luff curve design of the old jib. OR at least get a feel for what you are looking for.

Wouter