SUP Silent Deflating Device

This is only a first trial as I was required to very silently defalte my SUP (BlueFin) in a lake area where horses swim.
It requires an M5 insert (e.g. CNC Kitchen, short or long version) and an M5x20mm hexagon bolt.
Before screwing the devive onto the valve, make sure the bolt-screw is flat to the inner surface of the device. Then gently screw the handle in. For super-quiet operation, put a towel onto the valve area. After a while, remove the device and open the valve on the SUP for complete deflation.
Tested with PETG (Extrudr Metallic) on air temperature 35C.