You could run a line from the bow chainplate to the stern chainplate (or chainplates) and then measure the distance to the sides of the mast partners from there. That would give you a pretty good idea if the mast partners are on center line or not. If your' chainplates aren't located on centerline, especially the bow one, you've got some other worries to deal with first.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.