From your description it sounds like we might need to replace your Crydom Relay. It acts like a little capacitor and basically stores incoming power and releases it at a steady stream to the machine. If something goes wrong with it, it can "spring a leak" for lack of a better description. Then it "leaks" a tiny burst of excess electrical power that makes the needle bang down.
Call our service team and we can talk to you about what needs to happen to fix that.
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