As said above, before you touch those Martins, please do your research to see what you have. A vintage Martin can worth a chunk of change. What models are they, and if you could, post some pictures here so we can help you determine what exactly they are, and if you should touch em as far as changing anything. Also like said, as much as some of those martins are worth, you can sell one (even a basket case depending on model), and buy one or two nice custom built ukes with all current hardware and premium woods. Find out what ya got before you take a sawzaw to them, lol..