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Old April 9, 2012, 04:27 PM   #3
Senior Member
Join Date: December 27, 2010
Posts: 166
Mainsprings, like other gun parts, often require hand fitting. Grind down the sides of your existing monster spring in an hourglass shape like my exaggerated drawing shows. Go slow as with all metal removal projects and don't allow metal to overheat.

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