Join Date: Sep 2008
Location: Home Port Seattle
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This may sound too obvious, but my first starting point would be to check whether or not the mast is perpendicular athwartships.
You can check this by using an adjusted main halyard as a measuring tool down to identical points on both sides of the boat. You must be careful however to apply identical tension to the halyard when doing so.
Synthetic Rigged Wauquiez Pretorien 35