The easiest way to do this job is to remove the drain plugs but the part that they screw into within the slider may turn. If that happens a special tool is required to hold it. The procedure described here avoids that danger; it does not need any special tools.

Note on terms: the fork tube (a.k.a. stanchion) is attached to the yokes (a.k.a. triple tree) which pivot in the frame while the slider (a.k.a tube) holds the wheel. The least ambiguous terms, "stanchion" and "slider",...