Oops. I went to hang the pendant mount back on the mill so it wasn't sitting on the bed and thought I'd use the lifting lug to secure it instead of the bolt that was in there. This piece went 'snap' just as the lug was getting snug. It appears to be aluminum so I can take it to work and weld it up on Monday. Once it's repaired, I'm going to model and 3D print a spacer for underneath this to provide a bearing surface for the mounting hardware.