Does anyone know a source for a replacement push on/push off/hold to preheat button switch?  I just got a mid-century banker's lamp that I'm planning to refurbish, and the switch isn't working right.  Thanks!

Would the Leviton 388 be what you're looking for?

Dazor also sells replacement push button switches for their lamps.

Thanks, perfect!  The one-button 388 is what I need.