Hi in this video I install a Wolff hammer spring pak (reduced power) in the Smith & Wesson 6906. I imagine this would be the same for the 59 series as well as other models too. The stock number of this is 26582 and midway part numbers (either) 310146 or 102014. The kit inludes a 17,18, and 19 Lb hammer springs.
When I test fire it I will tell you which spring will fire foreign steel case ammo. UPDATE: it works with wolf and silver bear ammo!

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