Need help with driver..

Okay so I have an o-like driver I am wanting to use in a build, the host is the guidesman. The host has a positive contact in the pill for the driver positive. The o-like 445 driver has a spring for the negative to battery.

How do I get the negative from the driver to the host for the battery? Do I need to unsolder the spring and solder the negative to the wall of the host or something? Could that act as the negative path to the battery? Or am I wrong

I'm sure it's an easy fix, I'm just not positive on where to solder my negative from the driver to for the battery.

you just bridge the case pin to the neg pin to complete the ground
the guidsman only needs a positive wire going to the switch ( the round metal thing)

I put a wire from the case pin to the metal spring on the olike driver befroe i saw this, and it didn't work... and my aixiz module, that my diode is pressed in, the threading is jacked up, and you cant even get a glass lens in there, and I think i screwed up my glass lens. two of them actually