I've read in several places that adding an extra charcoal grate in the WSM to avoid charcoal sifting out prematurely. The general suggestion is to get an extra WSM charcoal grate. Well I just found out the 18" charcoal grate that comes with the Jumbo Joe fits just inside the charcoal basket and makes a perfect crosshatch. The only reason this is important that the grate of the Jumbo Joe is a bit less expensive than the 18" WSM grate. Hope this is helpful to someone else.