Food Processor Feeder Tube Hole - What Is It Called and How Does It Work? I've seen a useful tool on some food processors before, where they have a small hole in the feeder tube that is perfect for making mayonnaise. If you fill the feeder tube with oil, the oil will fall through the hole one drop at a time, taking all the difficulty out of starting the emulsion by hand. I had a couple questions regarding this tool:


What is the right terminology for it? I always think of it as an "eyelet dropper" but I have no idea if that's an accurate term.
Is there anything special about the hole's construction that slows the oil to a single drop at a time? Or is it something about the viscosity of the oil that does it?


I enjoy making homemade mayo, but doing it with my blender is a real pain and I'd prefer to not have to upgrade to a larger food processor to automate starting the emulsion. I was hoping to just 3D Print a plug for my blender's lid that would include one of these holes, but I figured I'd ask first and see if the hole needed some special properties to work the same way...
From the cuisinart manual parts description section(emphasis mine):


  
  A small removable pusher that fits into a central tube in a large
  pusher. The small pusher is for processing food like single carrots or
  cucumbers, for continuous feeding of small, hard food like garlic,
  onions and chunks of cheese, and for adding liquid while the machine
  is running. A funnel helps when adding dry ingredients like flour and
  sugar through the small feed tube.
  


So it looks like you are using it correctly. I am going to have to try using this when adding milk or butter milk to my biscuits.