I have 2 potholes in my carb pathway. When I get impatient with my brick, I start thinking the potholes are altering the aerodynamics of the pathway. At that point I realize I am probably already medicated. @Megaton The 2nd ridge down, where the screen rests on. Is that one also similar and uneven? That could affect performance. If it's just the top ridge: well, the metal cylinder also rests on that. Does it shift around easily there? Even with the magnets, that could affect the seal; which would affect performance. That would probably bother me enough to send back, aesthetics aside. Is that walnut?