Only the 321 & 323 Automatic Door Bottoms (ADB) need to be re-handed by rearranging internal parts. For these ADB's, you can remove the set screw from the side of the unit, then from one end (or the other) push the contents of the ADB out of the track. Slide the contents back into the opposite end of the ADB. When installed in the correct handing orientation, the plunger will push against the hinge side jamb. Put the set screw back in and tighten.
All other models of ADBs can be reversed by installing them with the plunger oriented in one direction or the other.
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