Epson BrightLink 421i Guide D'installation page 28

2. Secure the arm plate temporarily using two M8 × 16 mm hexagon socket head cap bolts.
Bar on wall plate
Arm plate
Wall plate
M8 × 16 mm
hexagon socket
head cap bolt (×2)
Arm unit
Caution
Take care not to trap the cables between the mount arm and wall plate.
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