.. I must have made it
thinner than I intended; but since oak is also 50% stronger than mahogany,
that shouldn't matter.

maybe, maybe not. if it's too thin for the slot it can vibrate while
sailing. you can always build it up with a fibreglass coating to make it
fit better. with wood you can always take more off, but you can't put it
back on. that's what fibreglass is for, although it makes the product heavier.

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