I started on my uds project last night. The drum which was bought brand new seemed to have a perfect circle at the rim. I did an over night burn then had it sandblasted today. I got it back and there is an ever so slight oblong shape in the rim. The lid fit with a good push. My attempt at fixing this is I clamped the locking lid ring thingy back to force it into a perfect circle and ill heat it up in another burn to temper it back. Not sure if this will work. Any suggestions?