JM2C but the roll crimp adds allot of structural integrity to the top of the drum.
An easy way to remove the top is to use a cold chisel and a hammer cutting around the inside like a can opener following the profile . To get the lid to fit cut the bowl from the grill about 2- 2.5" below it's li[ and bolt it into the top of the drum giving yo a perfect seal.
I never met a Cow that I didn't like with a little Salt & Pepper! Certified PORK-A-HOLIC