Bill of materials: 1x M8x110mm bolt 1x M8 nylon locknut 2x M8 Form A (normal) washers 1x M8x25mm or penny washer 3x 8mm axle 22mm x7mm bearings (from skates) Optional: 2x 10mm O/D x1mm thick lengths of aluminium tube cut to fit as spacers between the bearings The 3D printed parts: 1x Hook support (no supports needed) 1x Spacer (no supports needed) 2x Spindle halves (with supports from the bed) Fit the washers on the outside of the bearings at either end of the bolt. You may need two washers to space the spindle just far enough away from the face of the support. The lock nut fits hidden on the inside with a washer against the plastic support.