Nope, no catastophe.
Kept hearing a sound like a loose hub cap, but I don't have hub caps, so I put the car up on stands and spun each wheel until I found the culprit. Took off the drum and there it was, laying in the drum. Put it back on and started adjusting it outward but I had to turn it against the ratchet to expand it???!!! That ain't right! Luckily I had a spare left side adjuster.
Another good reason to inspect them every year.