Agreed, the image of using a grinder on the mast, while aloft, scares the hell out of me. It's surprising, but good for you, that it's the best pick.
I always use 2 holes, drilled several inches apart, connected using a jigsaw and filed smooth. What kind of blade were you using on the jigsaw?
For example, I just cut 2 exits in Shields mast with a good Bosch jigsaw, and it took less than 30 minutes from marking to done.
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