Casio YM-80 - Manual (Page 19)

Attaching the Covers
EN-18
z After adjustments 1 through 6 are complete, tighten the screw with spring washer (fixing screw)
securely.
Attach the upper and lower wall anchor plate covers and the arm cover.
Attaching the Lower Wall Anchor Plate Cover
1. Align the four hooks on the back of the cover with the four holes of the bracket.
2. Pressing down on the cover with both hands at the locations of the hooks, slide the cover downwards.
Screw with spring washer
(fixing screw)
Attaching the Covers
Upper wall anchor plate cover
Lower wall anchor plate cover
Arm cover
Holes