I picked up a couple of pierce electric uncapping knives at a tag sale today. Having never used on of these before, I was suprised just how hot these things actually get. I can see how scorching the honey could be a problem. There is a small set screw in the center of the knife which I believe controls the temperature, but I am thinking about adding a dimmer switch of sorts to control them better. My question is; what is the optimum temperature I should be looking for?