Cigar USB adapter comes off

The USB adapter for the cigar socket will come off due to vibration while driving.

I thought it was charging, but I was feeling stressed because it was less than 20% while it was still out.

The frequency of pushing the adapter many times by hand increased, and I considered a device to prevent it from coming off, but it seems that it has been improved by making some modifications.

First, the metal part in the center of the adapter is the positive terminal.
If there was any dirt on it, I wiped it off, and then I took out the lock and the minus terminal, which have two metal fittings on the side, to the outside.

With this response, it seems that it has been revived, so I decided to see the situation.

The adapter is a two-piece one, and since it is for Android 2 meters and 1.5 meters iPhone, voltage drop is undeniable, but there seems to be poor contact of the USB part.