For what it is worth, I used this spring:
McMaster-Carr 9663K13
302 Stainless Steel Cut-to-Length Compression Spring, 20" Length, .187" OD, .017" Wire Diameter, packs of 1
You just cut what you need, and save the rest for the next rifle. It is very weak (almost like no spring), but does enough to keep the firing pin to the rear and fully in the hammer's path.
Since I upgraded to a Timney, this spring has eliminated the light strike.
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