I do not have a sand Muller, (and I do not want to make one or buy one). Is there a simple way to use a drill press? (Sensitive drill press). I have made up my own green sand. Just using kitty litter, play sand and a little bit of water soluble oil. (I've also been playing with some oil based construction Clay with some small fires). But the green sand seems to be holding a good finish on aluminum so far. But…, It really burns and leaves big clumps. I've been pulling the big clumps aside, not sure what to do with them. Repurpose, or get rid of. What do you guys do?