What size is the button nut?

[Evilpenguin]

On standard Happ Pushbuttons you can buy a button wrench.  What is the size, I was to use either a wrench or a socket, instead of having to buy the button wrench.

Jason

[JustMichael]

You don't have to buy the button wrench.  The button wrench comes in especially handy when there is no room for your fingers.  On the buttons I measured, the nut on the button appears to be 1 1/4" wide and the button wrench opening is 32mm wide (just slightly bigger than the button nut).