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Practical Boat Owner - - Practical -

When the fix­ing points were marked up, I drew a line through them to join up the cir­cles. I’ve drawn a cen­tre­line through the holes which gives greater ac­cu­racy be­fore drilling – it’s rather too easy for a drill to wan­der around a marked cir­cle, in­creas­ing the mar­gin of er­ror.

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