Casio YM-81 User Manual page 29

Attaching the Covers
4.
Attach the left and right wall anchor plate covers.
 As shown in the illustration, attach the right cover first and then the left cover.
Left wall anchor plate cover
5.
Install an M4×20mm screw into the screw holes in the bottom of the left and right
wall anchor plate covers and tighten it to secure the covers.
M4×20mm screw
EN-28
Right wall anchor plate cover