I thought the issue was the thickness of the rolled lip on the pots. Some weren't rolled tight enough, making it hard to slip the SJ lid on top of the pot. The easy fix is to take some pliers or similar tool and an old towel to gently crimp the rolled lip down, so it's not as thick. It's only aluminum, so it bends pretty easy.
Modded Brinkmann Gourmet. Basic UDS. Rescued 22.5" OTS. Weber SJS. Stubbs. B&B Oak Lump.
Cannondale 2009 F8 (for burning off all the great BBQ)