Gas charged shock absorbers are filled with high pressure gas and therefore never remove the snap ring from inside the top of the tube in order to prevent the possibility of personal injury from its contents expelled by extreme force. Using safety glasses when centerpunching and drilling of the shock absorber to prevent injury but avoid puncturing tube of shock absorber. Start with an indentation that is 10mm (0.4in) from the bottom of the tube with the help of a centerpunch. Put the shock absorber in a vise horizontally while the shock absorber rod is fully extended. Drill a hole in the shock absorber with a centerpunch using a 5mm (3/16 in) drill bit, allowing the gas or a gas/oil mixture to exhaust; Use shop towels to mop the escaping oil. Then, apply the second hole, make an indentation in the middle of a tube with the centerpunch and drill a 5mm (3/16 in) drill out there, which will also release oil. Finally, take the shock absorber out of the vise, make the vise holes, and vise hold the shock absorber horizontally with the tube containing holes down, and shake the rod in and out of the tube to drain the oil.