Materials: 1x M4x40 bolt 1x M4 nylon locknut 2x M4x10 (Form C) washers 1x M4x12 repair washer 1x M8 washer behind the inner bearing over the plastic spindle 2x 8mm axle 22mm x7mm bearings (from skates) Optional: 1x M8x1.6mm spacer between the bearings 3D printed parts: 2x pulley halves with supports from the bed 1x Stand with no support 1x Support with no support 1x Spindle with no support The photo shows the lock nut on the outside however if you are lucky you might be able to hide it on the inside by using washers to take up the length of the bolt.