FX Impact Hammer Spring

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I thought you guys would be interested in see this. I installed a power plenum today and when I took out the original hammer spring I found this. The spring guide could not move. I don’t see any defect in the spring. I was running my reg at 150. It seemed to be performing fine. However I can’t seem to get any more power than I had with the original plenum. I have watched Ernest’s videos over and over.