Mine had the weded in recessed lid, so I just took my handy dandy Harbor Freight 4" angle grinder with a metal grinding disk, and ground off the top edge where the lid metal is pinched and welded to the drums outside lip... about a 1/16",
One you grind off enough to see that it's two separate pieces of metal (it looks like there's a crack in it), then I started to beat the crap of the lid with a hammer, close to that weld, all the way around... eventually, it came was completely pushed down, and all I had to do was turn it 90 degrees and pull it out.
I cleaned up the edge a little with the grinder, and the lip around the top keeps the drum rigid and strong... If you need to use the lid, you can take a pair of vise grips and slowly coax the edge out in 1" intervals around the outside, until that lip fits over the rim. use the rim as a form and beat the lip back down over the rim.
a couple of tool box latches will pull it down tight if it's tweaked from the wacking.