It's likely you could get your hands on a better quality 9v connector but it still needs to be soldered on. The stock will be fine once it has a decent solder joint.
*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