wet and dry fine sandpaper and model files, you get in return from the effort you putin. get the metal to about 1.5mm of your desired finished line and then use wet and dry moving form rough to fine, you want to have it lived and true before you use your last grade wet and dry. your last grade should be the one that smooths/polishes the edge for end result.
dont be fooled either, jigsaws are no neater, they just cut faster. spend a couple of hours and youll have a cracking end result, do the job in 20 minutes and thats the sort of job youll have.
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