I ordered the Shapeoko 3, but they forgot to put the spindle mount in the package. Because post takes a loooooong time to arrive on the place where I live, I redesigned this mount so I am able to use it, while waiting for the part to arrive.

It works fine, but let the spindle work on high speed and set the machine at low speed. So that it doesn't break.

It's easy to mount to the metal plate. Use washers, bolts and nuts to tighten it in it's place. I left holes (see photo 2) to reach for the washers and nuts.