Been trying to work out why some times my sails need a couple of cm's more or less downhaul. Using the same extension etc. I've got 2 Severne apex 490 mast, I was thinking that maybe they where different lengths so I put them side by side and nope they are the same then today I discovered that one mast has a longer bottom section and shorter top so if you mix the tops and bottoms up the overal length is either 3cm shorter or 3cm longer.

Glad it wasn't me going crazy but why would they do that?