I am grateful to Tom Anderson for showing me how to properly tweak a truss rod a few years ago and it set me off on my amateur dabblings in setting up my own guitars. Recently, with no money available, I purchased a Fender acoustic for $200 at guitar center to have something to play. The tone was a bit thin and the action high so I set about doing what I could. The plastic bridge pin snapped on the low E and GC manager was gracious enough to give me a new set of Ebony pins for free for my troubles. The new pins, a new set of Martin SP 80/20 strings, a truss rod tweak and my first attempt at shaving down a bridge came off pretty well. I was amazed at how much the ebony pins brought some bass and warmth into the tone and the action is amazingly fast now. But I think I went a little too far on the bridge shaving as my D string buzzes now, most prominently when fretting the 4th to 8th fret region. I checked the relief and found I overcompensated too much and so loosen the truss rod again. But the buzz is still there. I think I have some more play in the relief, but not much. But should it come down to it, my next step I suppose would be to attempt a shim. What material is best used for a shim and can anyone tell me the best method for shimming properly so that the saddle still sits evenly in the slot? I understand if it's not even, I could lose tone and that I might lose some anyway just by nature of using any kind of shim as I'll have less direct contact between saddle and the base of the slot. Any tips would be greatly appreciated -thanks. And just a suggestion to those who are scared off by the idea of working on their own instruments - though I would hardly say my skills are up to snuff to a professional luthier/repair tech, it's not as difficult as you might think and it's fun too.