Hi all, I recently bought a Yamaha RBX775(the discontinued model) 5 string bass guitar. It's a really good bass, and the fretwork is surprisingly consistent. After I brought it home, I proceeded to use various screwdrivers to tighten and adjust the screws on that bass. Out of the 4 bolt on screws, I discovered that 2 of them(the ones nearer the bridge) just keep turning, no matter how I try to tighten them. The neck itself didn't feel loose to me. I visited a local luthier/repairman, and he removed the neck and screws, put a bit of glue into the screw cavity and assembled everything back together. He claimed that the glue will harden fast, thus ensuring that the screws will be tight with the neck joint. A few days later, I tried tightening the bolt on screws again. This time, there were slight improvements, but I was still able to turn the screws indefinitely, if I use some strength. They were not as loose as before though. So I'm wondering, if the neck joint seems tight, is it ok that the screws don't thighten fully? How to gauge if the neck joint is tight enough? Will my bass's neck joint screw present condition affect the B string and the overall tone? I will appreciate whatever info and help from u guys, thanks in advance.