I'm working on a Gibson Thunderbird bass. The pickup screws keep working their way out, and when I took them apart I saw that they screw into wood, with a spring on the screw between the pickup and the body. No surprise there, but I question the wisdom of having an adjustment screw screwing into wood. So far I've just filled 'em and drilled 'em, and that works, but I'd like to find a more permanent solution.

Is there a place I can look to get a metal insert/bushing to put in so the adjustment screw goes into metal? I can get the exact parameters if necessary, but for now I'm just wondering if such an animal exists. The screws are black, so if I have to replace them I'll need black ones, as any other color on this thing will look out of place.

Thanks