Ninja Auto IQ Blender Handle

My mother In law had trouble locking the container onto the base, so I came up with this it uses 2 "O" rings for traction, it works quite well.

You will need a 337 (.210" X 3" X 3 3/8"), and a 338 (.210" X 3 1/8" X 3 1/2") buna "O" ring or metric equivalents