3) attach the t-rail to the header bracket, Installation step 3, Attach the t-rail to the header bracket – Chamberlain 1280 - 1/2 HP User Manual

3) attach the t-rail to the header bracket, Installation step 3, Attach the t-rail to the header bracket | Chamberlain 1280 - 1/2 HP User Manual | Page 11 / 36