Quote:
Originally Posted by Breck Gorman
Ultrasonic works great on old crud. Doesn’t damage case coloring. But it will damage springs. Strip the receiver, and clean springs by hand.
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I've never heard of a coil spring being broken in an ultrasonic bath, but flat springs, such as those in a Hammer gun lock, start to resonate like a tuning fork at certain frequencies, and there have been a few cases of reported broken springs right at the return bend.