My G string is a little sharp, and I adjusted it to lower the pitch, but the screw reached the end, and it wont spin anymore. And the string is still sharp.

Is there anything I can do?
do you mean the screw on the bridge, do you have a floyd rose? If thats what you mean then just loosen the second screw on the nut, make the screw at the bridge go to about half, and tune the string relatively close to what it needs to be with the headstock tuners, then tighten up the nut and do the fine tuning with the screw again, and that should fix your problem
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