aloha everyone thank you for your being so kind and wise i am trying to find a way to get this message through. please be so kind and patient with this cyber fool. i have been making and playing my first electric guitar for 27 years now and am now on my third set of tuners. the first was grover, chrome, 12:1 ratio, the second, grover, gold, 14:1 ratio, and now i have some gotoh 510 deltas, 21:1 ratio, antique gold, with "ebony buttons" which turned out to be high grade black plastic. this is my quest--to find an insert so that i may make my own buttons from some select abalone. any ideas? thank you all for being here. a guitar player andaman