Oy
Hi again,
The image of using a grinder to cut holes, especially while on a stepstool on deck, just gives me the shivers. It is so easy to lose control, and go cutting off in an unintended direction, so easy to get kickback and hop. Some shops use routers, but even those are best done witht the mast on the ground, and templates to steer the thing.
The jigsaw is likely surer, but even that can be an evil problem. Be sure to wax the blade, to mark clearly where you are cutting, to tape off the adjacent area so the base doesn't scratch the mast, and to get into the most comfortable, braced position possible.
Also, watch out for conduit in the mast, plus all the other warnings I'm not thinking of at the moment. It's hard to uncut this stuff.
Fair leads,
Brion Toss
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