I am trying to install liftmaster LJ8950w to my roll up garage doors. It says to mount it on the drum with 3 bolts. But the bolts don't line up with what I think is my drum. Am I supposed to drill it out? It appears the drum is plastic. Can anyone confirm the first and last pictures are the drums? Does the manual chain opener come off and it mounts on that side? The doors are from carolina carports. Commercial door model 101.
Thanks for any help!
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