Swim made overhead out of titan and teflon pipe and used some teflon tape also.Stirrer used was 500 wt drill,variac connected in between so drill got only 30-50 volts or so,nominal for that drill is 220 volts so i calculated its power was about 15-30 watts with such voltage.Drill had a some kind of transmission like 2:1(motor 2 turns,stirring blade 1).Drill was attached to stand with ring and clamp and these two connection held it pretty tight.Raf did sucessful performic and hydrolysis with this kind of improvised equipment without problems.Drill is usually designed to work hard short amount of time,but with that low voltage,it was ok for continous work(18 hours straight) also.