If you’re having venting problem, take a fine stone and swipe the top of the mould where the halves meet. Not a big bevel, just a few strokes to show a “shine”. Both sides. This will be enough.
Want to sharped the sprue cutter. Chuck a #10 screw in a drill from the bottom of the plate. Pull down and give it a spin or so. Follow up by polishing with a flat stone, lightly lube and cast./beagle
