I just received 3 first prototype buttons from Rich Berger, president of Grover. These are not small guitar buttons as they might appear.- they are newly made fro their mando tuners.. Take a look at the pics and let me know what you think. The 2 "half round" buttons are not the same-there are subtle diffences in the size and shape. Top to bottom they are widest to smallest on my Eastman. Here's a chance for direct feedback to the manufacturer.