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Hroar said...
Although they recommend a SDM 460 for the 7.0 Noah I find it works better on a 430, had 2cms more downhaul than spec that day. Found it has better leach twist & easier rotation on 430 as well, that was on Severne 90%, used 7.8 on Friday on Naish SDM90% with only 2cm extra, found it rotated better than Severne. The reasons for that is the Naish has a glossy coating & narrower diameter than the Severne, I found the Severne mast much harder to insert up luff pocket. I have ordered a Naish 430 90% off Simon.

So swapped he Severne 460SDM for a Naish 460SDM and the Noa's rig much better, to the specs +\- 2cm. Thanks for advise.
Funny that the Severne and Naish masts are supposed to be compatible, the difference is very obvious on these sails.