Martijn

I'd fairly much agree with the above; but maybe even slightly tighter ! I have mine set up so that the leeward shroud hoes not really go slack (that you can see; but it is slacker as the mainsheet does streach the forestay and shrounds) when sailing upwind untill some downhaul is applied; I set my rig up with minimal prebend (20mm) and leave it there. The way I set my thension up was slightly different from Bruce :

1, Set the shrounds so you have the mast rake you want and then connect both forestays and the middle one that holds the pole up.
2, Tension the middle one until you have just a little bend in the pole
3, If the forestays are slack at all, then put them down a hole or 2 each side (using a mate hanging on a trapese wire to add tension to the shrouds) and bingo; If I remember I will measure the rig tension next time I am at the club (2 weeks time).

BUT always remember to do rig settings with the dolphin striker tight !