If you are talking about the gear-looking part on the drive shaft that meets with the bottom of the blade assembly, it is called a coupler or coupling. I haven't found one for Ninja, but there are a lot for kitchen aid and waring around. I would wonder if one of these is 'compatible'.
If you are talking about the gear-looking part on the drive shaft that meets with the bottom of the blade assembly, it is called a coupler or coupling. I haven't found one for Ninja, but there are a lot for kitchen aid and waring around. I would wonder if one of these is 'compatible'.
Example: https://www.ereplacementparts.com/coupling-p-2142318.html?gclid=CjwKCAjwrKr8BRB_EiwA7eFapmKhd6Ycpav5_USY8E4kjWvk1Fajx3rlL_0SvKL_2CUDUFoYmRg9sBoCq6UQAvD_BwE