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I think Dean is spot on..could also have had a nick or other imperfection as well as an improper temper/ht but ultrasonic sure does shake things up with very small and rapid motions...not always so good for a part with a lot of internal stress.
I had both springs break in a Simson (Merkel) from having been setting cocked for a long period of time and once I started using the gun as intended.
The Following User Says Thank You to Scot Cardillo For Your Post: