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4.
Place a 5/16" washer (N) onto one of the 5/16" x 3" lag
bolts (O), then insert it in one of the mounting holes
and tighten it with a 1/2" socket wrench. Do not over
tighten the bolt.
5.
Use a carpenter's level to level the mount again then
mark the three remaining mounting hole locations.
6.
Use an electric drill and 1/4" wood bit to drill pilot
holes at each of the remaining mounting hole
locations.