I guess that going for stiffer battens that sail was designed for can cause problems, but going for more flexible battens or battens that has different bending characteristic for 2up would be possible. I wont be getting those for now, this was just theoretical speculation if it could be done <img src="http://www.catsailor.com/forums/images/graemlins/smile.gif" alt="" />

Thanks for your replies, I got the answers that I was looking for.

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Valtteri