Tuning machines are a bit of a mystery to me. A luthier at a festival was looking for a rattle in my bass and told me the machine screw on the E string tuner was too small, diameter-wise, and that someone in the past had merely wrapped it with a bunch of teflon tape and shoved it in the hole. He didn't have the right size replacement, but suggested that I could remove the screw from the A string tuner and take it to the hardware store to find one the same size. My question is, is the whole thing gonna fly apart if I take that screw out? Should I loosen the string first? Also, is the tension on the screws adjustable at all? one tuner is very hard to turn and I would like to loosen it up a bit if that is possible. My bass is a '64 Kay M1 with original tuners. Thanks.