Quote:
Originally Posted by KLYDE
Mainspring screw should be turned tight. If the original mainspring you removed is cupped/ribbed, more than likely it is a Wollf. All S&W springs are flat.
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+1
I don't recall seeing a ribbed factory main spring and yes, the screw should be screwed all the way.
As am I'm sure you're probably aware, some will file the length of the screw once they've decided where it needs to be for lightened pull but still remain reliable.