Thanks for the replies- I have the original manual with the relevant diagram, I was trying to link the "theory " of this with the practicality of the actual used kit! The manual simply refers to putting the lever in the clutch nut and moving it aft to release it, but of course it doesnt when you do, the whole gypsy moves!- so wanted to be sure it was seized, not me getting it wrong! It looks as if I will need to jam the gypsy & then try that brute force after some more penetrating oil, tho I might also try heat- eg boiling water (windlass is off the boat). The manual doesnt give any info re disassembly, but I guess it will follow naturally if I can get the clutch nut off. I think the internal chains are OK as the windlass itself works fine- & I have replaced the oil & no leaks so seals etc look alright. Its just that bl88dy clutch!