I have a 331 with a swing keel and I have been informed there is a zinc that needs to be replaced up inside the keel and that one most lower the keel to execute. The issue is that I do not know what type of zinc is needed to do this. Does anyone know what size zinc goes here? I would like to get it replaced while my boat is in the sling for launch, but that is any day now. I have been trying to contact Beneteau, but apparently their website has been down for multiple months and I am not getting a response.