ClusterTruck; because that’s what it is

[clay68c10]

At this point I was ready to enlarge the hole.
First I carefully used a thin stepped drill. It worked ok initially, but when it caught on the uneven back side the tip broke off. No bueno. At least it didn't harm anything.
Next up was a thin tapered die grinder bit. I used it in my drill vs a die grinder. That gave me better control and it didn't want to bounce around like they sometimes do in thin material at high speed.
It ended up being the best tool for the job, hands down. It didn't cut too quickly, it cut evenly, and it didn't catch. The only thing it did on the thicker weld globs was cut slower because the material was thicker.
Success!