All of my life I've been a little overboard when it comes to symmetry and exactness but I'm better now. Anyway, Saturday before a 10 hour smoke I decided to try something I've been pondering for a while. I grabbed a set of center punches to use as gauges on the 3 lower grill vents of my 22.5" WSM. I'm pretty good at eye-balling the openings when adjusting for raising/lowering the temperature on the smoker but my personality kicked in. I'm now using these center punches to make sure all the lower vents on my smoker are opened equally. A set of drill bits can be used to do this too but my center punches were handier. If I'm going to adjust the vents I want to do them equally. I think it worked out pretty well. While the fire was going strong the 1/8" size worked out right to keep the smoker at around 225°F. When it was declining up to the 3/8" size worked best. Anyone else ever do anything similar?