That reciprocating saw idea does look fraught with danger, so for anyone who wants to build a Stir-O-Lizer, I took a photograph of the one I built. The picture will pretty much tell you how it went together. You'll need a rotisserie from a barbecue grill, six PVC end joints roughly the size of the bottles you'll be using, a piece of wood or Trex as a base, two hose clamps, and some wood screws to hold the rotisserie to the wood. The device spins at 2 rpm, so put your bottles in it about an hour before you are ready to paint, or you can leave them in all day if you want. It requires no attention once set in motion.