| I think you will find the case sheet metal is stripped. I work in a electronice manufacturing business and aluminum and sheet metal case holes get stripped randomly in virgin assemblies even with controlled torque guns. I suspect that the sheet metal case holes have had too much force when tightened in the past and the holes, not the screws are likely stripped. My 2 GK800rbs that I bought used have a couple screw holes stripped too and I see a few non original screws have been used. The solution we use at work is to use an oversized screw that is spec'd by our mechanical Engineer for rework. In most cases it is the same head and screw lenghth with the next size up thread. We also use loctite (the non-permanent bonding) on the case screws to prevent backing out from vibration (I'm pretty sure that would be a good thing for a bass amp). Anyway, maybe Bob G can chime in here and recommend what they use for oversize screws, or you can visit the hardware store and figure out the thread and screw size and try the next larger size. Caution, sometimes the next larger thread size is just too big, so proceed with caution. You can try a metric, sometimes they have an in-between size that works too. Worse case you could tap the hole one size larger but that should not be needed.
Good Luck, I'll let you know if I get around to replacing the few I have and give you the screw size I use.
Reb
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