I'm working on a new round copper manifold for my 10gal GOTT mash tun. It's the round style using 1/2" ID copper tubing. I've cut notches with a dremmel tool to allow the wort to pass through. I've cleaned up the outside, but looking inside the tubing I see shards of copper sticking down from where I made the cuts. I'm concerned bits and pieces are going to come off as the beer flows through. Am I being silly or has anyone figured out how to remove them?