Gun troughs technique

I’ve read build articles in the past where the builder said they deepened the fuselage gun troughs on an aircraft kit. I want to do that on the kit I have on the bench. What’s everyone favorite method to do that? Thanks!

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Round needle file probably gives the most control (might need a small pilot hole), but some folks just drill 'em out - I would suggest a hand mandrel rather than a power drill, since that one slip could mess things up pretty badly. :+1:

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