Where do I find tuning machine knobs?

[Eilif]

I was curious if anyone knew where I could buy just the knob section for tuning machine. Is it called a button perhaps?

I don't really like the "y" shaped knobs on my carvin, and would like to switch them out for a oval or cloverleaf or somesuch.

[topper]

Check Stew-mac They have just about everything. It's not a foregone conclusion that you'll be able to just change the knob though. I don't think they're really interchangeable.

[Cerb]

Most are, in fact, interchangeable. I don't believe Stew-mac has them, but I've found wooden ones on ebay before. You might check there.