This is my new favorite tool in the shop. I followed this guy's instructions to make a small sandblaster out of a soda bottle and a $5 air gun from HF. It works incredibly well. The only thing I did differently was make a smaller hole in the tube because I'm using actual sand (left over from our pool filter), not walnut shells like he did in the video. I can always make it bigger if I feel it's necessary. A 3/16" drill bit was a perfect press fit for the tube.