Pank got it on by literally standing on it, while I pushed 😅 After some fenagling around it's finally set up! 4 gallons of distilled water with enough room to add a coolant pack. I sealed the holes on the outside with big globs of hot glue so they don't leak if I overfill it This is so much nicer!
I'm building a new reservoir and wanted to put on this cool, air tight lid with a screw opening to limit dust ingress... MY ENTIRE BODY WEIGHT IS NOT ENOUGH TO PUT THE FUCKING SEAL RING ON D:< bit at a loss for what to do... guess I'll see if I have enough long clamps <_<