Thanks for the Reply Remi
I have baught the redline 490 mast as recomended for light sailors. I tried it on the sail today, but I still cant get the rotation without pushing the lower batten with my hand or leg.
When I pump the sail, the top battens rotate but come back again because the bottom one won't go.
I tried loosening the batten tension but it only added wrinkles in the sail without assissting rotation. I also tried the boom in the top and bottom clew holes but no difference.
Does it matter what base extension is used? I am using a North Powerx extension set on 20. its maximum setting is 42. I wouldn't have thought that 12cm extra would alter the mast curve much.