We did our first honey extraction today and now I have a question. I have an older electric decapping knife. It did not seem to hot and didn't glide through the wax as expected. During the clean up, I noticed a small brass screw head at the handle knife interface. I thought it might be an adjustable thermostat. I turned it in and sure enough it got hotter, back out and it cooled down. How hot should the knife be? Any tips on using one for next year? Thanks, PK.