Mackie SRM 450 Service Manual - page 23
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9) Reverse the drill and back the tool out. A quick, sharp twist once you start to
back the tool out will break the tool free from the insert. You do not need to
remove the tool slowly as with the installation. The metal bushing will easily pull
out along with the installation tool.
10) Using a small flathead screwdriver or similar tool, remove the plastic chips from
inside the pole mount hole on the bottom of the speaker. If compressed air is
available, blow out the inside of the new threaded insert to remove any plastic
chips that may be present.
Plastic burrs from insert installation
11) Take the installation tool out of the drill and remove the metric nut from the
threaded end of the tool.
12) To reinstall the black metal bushing, screw the installation tool back into the
insert a few threads and slide the bushing back down the tool – with the shoulder
of the insert up. Again, using the piece of pipe, permanently tap the insert into
place until it bottoms against the shoulder. Take care to reinstall the bushing
straight.
13) Remove the insert tool and pipe.
14) Reinstall the original pole mount bolt. There may be some additional friction in
the threads. This is due to plastic burrs protruding slightly through the slots in the
insert – this friction will decrease the more the pole mount bolt is used.