Gas charged shock absorbers are gas filled, therefore do not remove the snap ring from the top of the tube inside, there are high pressure and in such a case it may cause personal injury due to the release of extreme pressure in the contents. To avoid an injury, use safety glasses for centerpunching and drilling the shock absorber, being cautious not to punch a hole in the shock absorber tube. Start by indenting 10 mm (0.4 inch) at the bottom of the tube with a centerpunch. Clamp the shock absorber in a vise horizontally with the rod of the shock absorber being in a fully extended state. Drill hole in the shock absorber at the centerpunch with a 5mm (3/16") drill using a gas or gas/oil mixture to blow out the hole. mop up the escaping oil using shop towels. Then, indent in the middle of the tube with a center punch, drill another hole in the circle of center punch using a 5mm(3/16 in drill bit), which will also release oil. once more, use shop towels to hold back the escaping oil. Finally, take the shock absorber out of vise, place it over a drain pan horizontally with the holes down, and slide the rod up and down in the tube to empty all the oil out of the shock absorber.