Use only a finger and thumb on the screwdriver and tighten it up with medium pressure. Using only two digits will ensure its tight but not so much that it may bind and not turn smoothly. Regular maintenance a couple times a year, more if needed.
*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