For anyone who may be interested, I replaced the Dust Seal/Brake (got it
from EReplacement Parts) and that did indeed fix the problem. I sucked
out a bunch of dust from inside too. Now the sander rotates very slowly
when it is removed from the work.
The funny thing is that while looking up this issue online, I found a
number of posts from people who were not aware that this was in fact a
problem. Several thought that this was normal behavior for a ROS, going
as far as to say that you have to start the sander on the work to avoid
gouging into the wood when the disk hits it spinning at high speed.
I was pretty sure that wasn't the case, but what convinced me was
getting a second sander, one that operates properly.
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