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When I first tested the set, the fine tuning did not have much effect. I removed the tuner side cover and saw that a plastic gear engages a fine tuning screw on each channel coil insert. The plastic gear had split down its length. A goggle search for 14 tooth 1/4" diameter with a 1/8" inside diameter 3/8" long gear shaft turned up everything but what I needed. I could epoxy it, but that would probably fill up the gear teeth which might cause more splits. If I could find the right inside diameter c-clip/cir-clip I might be able to put it around one end of the gear and fit it into the tuner, but there is not much room in there. I noticed that only about half the length of the gear had dark grease marks on it from engaging the tuner screws. So I'm going to experiment with using some heat shrink tubing to squeeze the gear at the end that does not seem to engage the tuner screws. Here are some pictures of the split gear, the gear with two layers of heat shrink on one end, and with it mounted back on its shaft. The shaft has teeth that engage the inside of the plastic gear. The shaft is driven by the fine tuning knob and the mechanism moves the gear to engage it into the tuner screw teeth. The gear now fits snuggly on its shaft and works surprisingly well, for now...
Dave
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