With many thanks to Nosepicker,had a successful O2 wacker,but shook it by hand until my arms nearly fell off.While laying in bed with a bad neck,thought may beĀ an easier way than building a shaker.Pooky took a 2 litre pop bottle, half full of water and discovered that if it is spun about 2 revs per second(end over end)there is very good mixing going on.And possibly some marbles added may help stir things up.Methinks it would be easy to have a geared down electric motor spinning an axle at 120 or so rpm, with the pop bottle fastened to a bike wheel,or something of that nature.Has anyone done this? Thanks..