I just found out and ordered one from digikey. I don't know if I ordered the correct button? I know it is the same diameter as the "old" flat button. It has 4 lead, 2 for the LED and two for voltage. Digikey model EG5712-ND. It says it is for DC voltage. I don't know if that makes a difference for the shutoff function of the button itself. Any help?? thanks in advanceYou can get the button at places like mouser.com, digikey.com, automationdirect.com, probably many others, for about $10 each. I bought a Harbor Freight mini screwdriver set which came with the proper tool to open the swiper from the rear. The buttons are fairly easy to replace.