I stumbled across a second scale that I can use to park a hive on. This scale (the light blue one) is a 1,000 pound model, unlike my other scale which has a maximum capacity of 500 pounds. I would surprised if even the strongest hive weighs over 300 pounds, even when stacked with full honey supers.
I completely disassembled, wire brushed, primed with rust inhibitor paint, and then reassembled and painted each scale. I also turned the direction of the needle balance, primarily because I prefer the counter weight holder to be toward the rear of the scale. It was a fun process to restore these scales. Each one is over 50 years old, and they are surprisingly accurate.