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It is for changing the door to swing in the other direction I believe.
Sorry, there was a problem. Please try again later.I believe that is just an extra screw for when you want to change which side the doors open. If you lose 1 screw, you have a replacement. If you more than 1 than you are screwed. The irony. As for the plastic, it is probably to hold the screw in place when tightening it.
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