and hopefully someone will let me know if I am, the A142 is the direct predecessor to the A700. The two machines have a great deal in common, including the bleach dispenser system. I don't have a parts manual for the A142, but on the A700 the part number would be 211915. It's actually nothing more than a common Tinnerman fastener. Since Tinnermans come in a number of different configurations I've attached a photo so you can see which type you're looking for, and if you look at the McMaster-Carr link provided you'll see them listed as "rectangular speed nuts". With any luck you'll be able to find them in your local hardware store. If you have to buy them on line you could end up having to buy more than you need.