Prepare the aluminum alloy sheet (as shown by the arrow in the figure below), M4*40
screws, F624ZZ bearing (large), aluminum alloy, M4*8*1 gasket, plastic tube, and
M4 nut.
Use M4*40 screws to pass through the aluminum alloy sheet, F624ZZ bearing,
aluminum alloy, gasket, plastic tube, and M4 nut from the inside to the outside. As