What is the minimum button spacing that I can use?
The spacing that I show on my designs :-). (Seriously, I have fairly short fingers, so that’s pretty close.) Happ lists their buttons as having a 1.3-inch wide face. I measured the (non-Happ?) PAL nut from the Indy Heat wheel that I bought, and it measured 1-3/8-inches across the flats, so you could mount the buttons on 1-3/8-inch centers. At this spacing, the outer rings of the buttons would almost be touching and you would have to hold the nut and turn the button to install, because the button flats will be touching! NOTE: Some buttons may have a flanged PAL nut which would prevent this installation. Happ appears to be using a 1-3/8-inch total diameter nut (per their website) which would permit this installation. The PAL nut on the button that I used measured 1.5 inches across the points and this is the center-to-center spacing that I used. At this spacing, you might not be able to get a wrench on the PAL nut, but hand-tight is usually good enough anyway. This is a very comfortable b
