Gary, You are correct about the "smoke unit after-burner" which was indeed part of Cooper's "smoke system" and not a real super heater. I installed a correct super heater with stainless steel tube in-and-out of the flue and back to the Osmotor.
The spring pressure is very important but a surprisingly little pressure needed when 2 springs are holding the cylinder to the port face. I was going to modify the backing plates and replace the 2 springs with 1 mounted in the center of the rotation which would have helped, but what was that saying about a sow's ear? GaryB
