Quantity   Component name
2 × 608-2RS skateboard bearings
1 × Pen spring https://www.walmart.com/ip/Pen-Gear-Ballpoint-Pens-8-count-black-color-pack/896621816
1 × 1.0mm piano wire
1 × 2.0mm piano wire
2 × M3 x 12mm bolts
2 × M3 nuts