Originally Posted by Marin
However...... there is chain and there is chain.
The wildcat on our original windlass was stamped with the chain size and when we bought a new all-chain rode we made sure the new chain would fit using the chain supplier's test length to make sure.
When that windlass lunched some gears a few years later we replaced it with a new windlass, specifying the same wildcat size as the size that was stamped on the wildcat of our old windlass. Our chain rode fit the new wildcat just fine.
But when our friend replaced his chain and specified the same chain size as he'd had which was also was stamped on the wildcat of his windlass, the new chain didn't quite fit right and jumped and skipped on the wildcat. That's when he learned that within a specific chain size there can be "different" dimensions to the point where some won't fit the wildcat correctly even though it's the same size as what's stamped on the wildcat.
That might be explained by the fact when I bought new chain for our boat anchor winch 12 yrs ago now, I remember the fellow taking the order wanted a link of the chain to size it and he said - "ah that's short-link, 10mm, X grade (whatever - can't remember the word he used), a special anchor quality of chain anyway. The important bit being...if there is a 'short' link version, then presumably there is a similarly thick (sized) longer link version, which would not fit the gypsy.