I took things apart on my df520 and switched the motor and auger from side to side to accomodate my basement install. When I reassembled everything and lined the slot in the tube with the peg the pot is not perfectly level.
I searched the forum and I've seen where at least one person has turned the tube and renotched it so that it was level. However, I'm thinking if it was critical the factory would have spent some more time getting it right...or did the guy who assembled it before me not do something correctly?
It is not off from level much, but it is not perfect. What will the effects be with the coal feed into the pot and the ash fall off?
If it's an 1/8", I wouldn't worry about it. There have been times when the errors in drilling and machining left the pot hang about 1/2", which was causing problems. At that point it was good to cut the notch and level it up.