Promise Technology VTrack M-Class M200f Product Manual page 21

If you plan to use the mounting rails, follow this procedure to install them:
1. Attach one end of the rail to the back side of the rack's front post.
2. Reposition the adjusting screws as needed to fit the rail to the rack properly.
3. Attach the other end of the rail to the back side of the rack's rear post.
4. Repeat steps 1 through 3 to attach the other rail.
5. Square the rails in the rack and tighten the attaching screws.
6. Set the VTrak onto the rails.
7. Attach the VTrak to the rack's front posts with the screws provided.
Do not pull or push the handles on the Power Supplies or the
Controller units in order to move the VTrak. Hold the VTrak by the
housing only.
Caution
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Chapter 2: Installation