I think that I have read just about all I could find about adjusting the tophat. Before I go digging into it the question is: Is the tophat threaded or is the adjustment just a slide with the grubscrew lock? I got a new set of shims yesterday. I have calipers etc. I have become somewhat confused when the forums mention screwing it all the way in and then out 1 1/2 turns.
Another question: Does opening the gap increase the gas flow? I know using a Chrony will help but I am trying to get the chrony to give consistant results without errors. As soon as I can get the lighting sorted out I should be OK.