If a gun is unmolested and as it left the factory, then you cannot screw things up. This is because the front tang screw is timed and also has a bushing in the stock that prevents over tightening. And the rear tang screw is dressed off flush with the tang on the top side. If it is over tightened, it would be sticking up. Also, the depth of the wood inletting control how tight the screw can be as well.
Also, the safety jacket assembly in the stock when properly fitted, touches the bottom of the upper tang and butts against a step in the wood on the bottom side, preventing any up and down movement, thus reliable safety operation. Too many times I see poorly crafted stocks with sloppy fitted safeties that move all around and guess what, the guns do not work right.
Now, if the wood it shrunk, or the inletting damaged or had been messed with, it is possible for the over tightening of the tang screws to effect the operation of the triggers and safety. But I am not talking about only 1/4 turn too tight.
Just an additional thought about the Parker tang screw bushing in the stocks. It serves two purposes. One is to hold the safety reset Rod in place when the stock is off the gun, but I believe that the primary intended purpose was to be a spacer between the upper and lower tangs. Much like a pillar would act on a rifle. However, I find that the bushing usually falls a little short of the required length on most stocks to act as a true spacer.
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B. Dudley
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