One worry is whether I'll have to add weight later, after painting, to balance these elelvators. A popular suggestion is to add a platenut to the existing tooling hole so that later you could bolt on some lead weight washers. Some folks put in a 1/4 platenut. I just put in a AN3.
So I put platenuts on this tooling hole on both elevators.
I also tightened and torqued the counter weight bolts.