1. Clamp a shock absorber on a flat surface or with the piston pointing downwards.
2. Drill a 2-3 mm {0.08-0.12 in} hole at a point 20-30 mm {0.8-1.2 in} from the bottom of the tube, so that the gas can escape.
3. Turn the hole downwards.
4. The oil can be drained by moving the piston rod several times up and down or cutting the tube at the end.
5. Dispose of waste oil according to the waste disposal law.