I am planning to make a UDS and the drums I have (4 of them) are from a bakery. They have had canola oil in some and molasses in the other. The question that I have is they are not a removable lid, they are a close lid. How do I grind the lid off so that I can reuse the lid for my UDS? What grinder do I use? Do I use a standard grinder, a drimmel, I just don't know. Any suggestions would be great. Thanks.