Ok here is the default, 510 bottom of the Aqua v2 - you can see the plastic insulator around the pin, and the base cap that screws on to give the negative of the 510:
This is the hybrid adapter, from your spares package.
To hybrid, you unscrew the 510 pin, then remove the plastic insulator from around it, and replace it with the hybrid adapter:
Then you screw onto the M20x1 mod.
Note I have never done this personally but I am 99% sure that's how it all works! The hybrid adapter is definitely vital.
This is the hybrid adapter, from your spares package.
To hybrid, you unscrew the 510 pin, then remove the plastic insulator from around it, and replace it with the hybrid adapter:
Then you screw onto the M20x1 mod.
Note I have never done this personally but I am 99% sure that's how it all works! The hybrid adapter is definitely vital.