Chamberlain C870C Owner's Manual page 7

HARDWARE
Bolts (Mounted in the garage door opener)
Bolt
"U" Bracket
Cover Protection Bolt Hole
Lock Nut
Lock Nut
Bolt
1/4"-20
1/4"-20x1-3/4"
HARDWARE
Bolt
Rail Tab
Chain/cable
Bolt
Lock Washer
Nut
Nut 3/8" Lock Washer 3/8"
Rail
Grease Inside Pulley
Idler Pulley