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Power tuning hammerspring for your FX Impact MKI or MKII.
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This hammerspring has a bit more higher powercurve compared to the MKI hammerspring what will give you more flexibility and power adjustment options when using the powerwheel of your FX Impact. It's great when you want to tune your FX impact for slugs or hybride slugs and we preffer to use this spring over the factory spring when you use the powerplenum in the MKII
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