I tried this today and it work perfectly so I'll share. I got a sealed 55 gallon plastic barrel. I noticed the barrel is slightly tapered at the top. Figured I could cut it to make it fit inside itself for a tight fit sturdy lid.
I measured 1" down and 2" down from the top lip All the way around. I Cut both lines with my sawzall and cleaned up the edges with the grinder.
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