Thanks for posting a source for casters. I have a BA-123 that came to
me with one missing (but I think there is some bent metal on one or
more corners where the casters go)*. I should probably just get 2-4
casters and be ready to replace them all.
-ethan
* In my experience, lots of people used to sit on BA-123s, especially
people who were large enough that they should have known better.