First loosen it a quarter and re-tighten it the same to see the pressure needed to turn it. This is safe way to figure out if it is maxed.
If its maxed, take the nut all the way off and insert a washer or two. That spaces the nut out gaining you more threads.: No more maxed! Fender even sells the washers for about 7 bucks but you can get some at a hardware store for fitty cent.
*1962 Jazz. '74ish Ampeg V4B, 115/210. * '75 Gibson G3. *Epi Tbird. *Squier: VM Jazz, CV 50's P. *Squier VM Jazz Assoc. *MBC 641. Squier owners club