The next task was the electrical outlet under the sink.
Someone had previously butchered it, and it needed to be fixed. Most all sinks here have an outlet under them here. That is where the garbage disposal usually plugs in, and sometimes the dishwasher. We don't have a garbage disposal, but the Reverse Osmosis unit I got has a pressure pump that needs power.
I pulled the old blue box out, and made a repair to the hole on the drywall that had been ripped out. I used a small strip of aluminium at the back, and a little offcut of plywood in the gap, and then mounted the new electrical box inside the wall, and refitted the plug receptacle. I also found a cover for the outlet in my stuff in the workshop

Then it was time to re-install the sink. As mentioned, I used some soopa doopa constructiuon adhesive from Loctite.
I did a couple of dry-fits, just to check if the sink was bent anywhere, that it laid flat all around. Two corners needed a little tweaking, then I applied the adhesive and seated the sink. I used a shed-load of gym weights to hold it all down to make sure that it seated properly and didn't lift anywhere.