Small and simple spindle

Small and simple spindle for small lathe with 775 12 volt motor, total diameter 60 mm, piece diameter 40 mm, has four M5 screws with recessed nut to tighten the piece, as you can see in the picture has a self-locking nut M8 embedded where it will be inserted a pointed threaded bar M8 and locked on the other side with another nut, the design of the lathe foresees that the bar will slide into two ball bearings with a diameter of 22 mm and an internal hole of 8 mm, they are commonly used in the wheels for skateboarders, obviously will follow the project for the lathe, I'm working on it ....