Originally Posted by Carbon
Use an angle grinder with a grinding disc. It took me about half an hour to grind down the drum lip (the small rolled lip of a closed end drum, not the large lip of an open end drum). With a little grinding the Weber lid will fit snugly.
i did this as well on my closed top drum but needed to tweek the weber lid just a bit. now the lid fits nice and snug. start at the top of the lip and grid down until you see a seam and pull the inner portion of what remains of the closed lid out. then grind down the perimeter until your lid fits. you could even do this to open the drum i suppose. easy peasy.