For a big hook , a file is best IMO. For smaller hooks , I have a dremel looking thing with a fixture on the end to angle the hook in. Its really cheap but hard to find.
Anyway , I seldom use less than 6/0 anymore so a file is the best choice.
Another good benefit of doing mostly jiog fishing in the canal the last 7 years is that you usually lose the jigs before the hook gets dull. One problem you do have fishing heavy braid is that sometimes the tip gets bent out of alignmnet. its still sharp but it no longer points forward. You get this from when you get stuck and win the death pull to free it. For this I bend the tip back straight with needle nose pliers. you have to be careful to grab the tip in a way that allows good enough leverage to starighten but without touching the very tip which will dull it.
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