Make sure the strain screw is tight on your current mainspring. I don't know if Wolf has directions or not, but I've removed and replaced them for complete disassembly of the internals. Not hard, remove the grips, then unscrew the strain screw until the mainspring is loose, the screw does not need to be completely removed from the frame. The spring can then be slipped off the stirrup on the hammer. You can then slip the new spring's end onto the stirrup and back in the butt of the frame and tighten the strain screw. I have done this without removing the side plate from the frame, it's a little tedious, but easily done. It's easier if the side plate is off, but don't do it if you're not comfortable doing that. Hope this helps, but unless the mainspring is broken, many times the strain screw isn't tight or someone has shortened it in an attempt to lighten the trigger pull, causing the light strikes you are experiencing.
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