Changing flow direction on a Freezemod Flow Meter

I picked up [this particular flow meter](https://www.aliexpress.com/item/32965180014.html?spm=a2g0s.9042311.0.0.3cf44c4dP9ZDf7) and now its mounted to my rad and I have my loop planned out. The thing is that the flow meter has the inlet and outlet on opposite sides of where I want them to be...DOH!

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So the listing says that I can unscrew the silver ring to change direction but the thing is I have absolutely no idea how to do so.

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Anyone have experience with this part?

Edit:

You can use a pin wrench to unscrew this. If you don't mind slight damage, you can screw in 6-32 quarter inch screws into the holes. These screws act as the pins of the pin wrench. I used an Alan wrench to then to get leverage and unscrew