After years of making sugar propellants I was finally able to purchase some ammonium perchlorate. First thing I did was to build a vacuum propellant mixer. The basic construction is made from welded steel beams. Electric motor was bought second hand and most of other parts are salvaged from different sources. Mixing paddle can be replaced if needed, as well as mixing bowl. While mixing the bowl can be heated for reduced viscosity- this is controlled by a temperature controller. The mixer is almost done, the only thing left is some electrical wiring. The next two items already getting built are a vibration table and a propellant curing oven.