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Chamberlain B980C Manuel D'installation page 9

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Spring
Trolley Nut
Nut Ring
BEFORE
1" (2.5 cm)
1-1/4" (3.18 cm)
Nut Ring Slot
Nut Ring
AFTER
HARDWARE
Hex Screw #8x3/8"
(Packed with the sprocket cover)
Hex Screw
Sprocket Cover

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