Hell replacing the spring's was the easy part it's that damned little plastic sprocket that gives me fits.
Duma, try turning the spring to face the other way, so that it drags on the nut in the direction of tightening,not loosening
it's worked for me
P.S. a dab of blue Loc-Tite don't hurt either
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pzvg- "5 years and I still can't shoot"