Originally Posted by Bluesman
The only problem you will run into to is the hot grease from the Weber lid rolling down the outside of your drum. The Weber lid fits inside the kettle.
to be pedantic...
The Weber lid fits the outside
of their kettles. The lid on a WSM fits inside
the middle section.
The lid on my mini-WSM does fit outside the middle section and moisture condenses on the inside of the lid and dribbles down the outside of the cooker just as you describe.