You might try looking around the unit for a manufacture's label. Use it to search the net. Starting with www.XYZ.com. Where XYZ is the manufacture. If you don't have any luck, then it's just a game of call all the hardware stores (big and small). You could also check ourhouse.com. They've had good select of stuff. A local favorite for hard to find parts is McGuckin Hardware in Boulder, CO. I'll look their number up if you like. Please contact me via my email. I may not be back to this forum for awhile.