3) attach the rail to the header bracket, Installation step 3 – Chamberlain 2000SDC-R User Manual

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3) attach the rail to the header bracket, Installation step 3 | Chamberlain 2000SDC-R User Manual | Page 11 / 36 3) attach the rail to the header bracket, Installation step 3 | Chamberlain 2000SDC-R User Manual | Page 11 / 36
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