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i have put some pics on my page of the moisture meter i borrowed ,i realise that you are well progressed in your digging ,but i think it might save some work if you can get hold of one of these ,in saying that the meter might be too sensitive ,some areas of foam i have dug out are dry to touch and even though some areas along the keel are showing high readings when i push a hacksaw blade into the foam it has no moisture on it .but i have also found old repairs that have soft resin in them because they have probaly been glassed over wet foam,soft center so to speak.