In case the sliding drawer of Allcam ED20 sit-stand desk was knocked out by accident, here is a guide how you can fix/ refit the new tracks:
Step 1: Remove the old tracks
Step 2: Mount the new tracks
Fix the new tracks to where the old tracks are using the old screws and old screw holes.
Step 3: Push the sliding drawing inside the tracks
Hold the two tracks with your two hands,, then push the drawer inside the track gently with your body. Mission accomplished.
If you need to change the track for whatever reason, here is how you can remove the sliding drawing from the track:
A. Find the slim levers (on both sides of the drawer)
B. Slide the drawer out the track
Press down the lever on the left and hold up the lever on the right, then slide the drawer out gently. Job done.
This guide applies to the Allcam ED20 electric sit-stand desk, both the glass top and MFC top.