Thanks for the advice, Mooman. The LG 50 has open tuners, so I imagine my luthier could replace the geared cog.

Thanks for your suggestions, too, John. Some of them, like the graphite thing and tuning up to pitch I already do, but it helps to be reminded.

Still wondering, though, IS there a substance you can put on a screw to keep it from slipping yet still allow it to be turned with a screwdriver?

Genie