Original Stainless Bowl Nut screws on an off the bottom of the bowl.  Holds the bowl in place on the Bosch machine. Note: If you are replacing your Bushing, you can re-use your existing Nut if it's in good condition and is made of plastic. However, if you're replacing your Bushing now, and your existing Nut is the old stainless steel type, you will need to order the newer plastic Nut shown on this page to replace your old stainless steel Nut. The reason for this is that the old stainless steel Nut had different threads and is not compatible with the current-production replacement Bushing.