It's not really the typical set screw per se. Its the adjustment for the air-to-fuel ratio in the brass just above the aluminum base that holds the globe. I can't remember where mine is set and my trailer is in storage or I'd go look. Another thing to consider is how is/are your axle(s) and springs? I had a new axle made and had my original springs tested. As mentioned previously, a worn out axle will cause the whole trailer to ride rough.
4CU 2699 / AIR 10 / TAC AZ-1
I'm haunted by aluminum.
Charter Member of the 4 Corners Unit.