Or… How to remove a bunch of material without making a lot of progress…
The skeg was rough cut to size and loosely fit to the hull a few weeks ago. There were a few high and low spots creating small (4 - 5mm) gaps in several places where the skeg didn't quite match the hull. Today, I decided to trim it to a nice tight fit…
I marked a line on each side of the skeg by sliding a carpenter's pencil along the bottom; there were some very minor differences. Using the grinder (with a flap-wheel sander) and the palm sander with 60 grit paper), I sanded to the lines and checked that the skeg was square. Put it back on the boat… There were a few - different - high and low spots putting the small gaps in different places.
Repeat the process - except to mark the low spots not the entire skeg. Similar results.
Repeat the process: same results although the gaps were getting smaller…
The whole process reminded me of efforts to even the legs of a chair to eliminate a wobble...
I stopped when there were only a few gaps and those gaps were no more than 2mm. I could have kept going to the point of sanding away much of the skeg but decided thickened epoxy, screws and glass-topped fillets will have to do.
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