On the top gantry I found broken stuff and I was wondering how are supposed to tighten those nuts?

I noticed a bit of back and forth play on my z gantry and saw a bit of excessive play on one of my bearings and the bolt wasn’t super tight. There is zero room to get a wrench of any type in there so is it safe to assume that the printed part itself is designed to hold that nut in place while you tighten it?

I know that’s pretty much how I assembled it a year ago or so.

Then I managed to crack that piece completely off. I’m sure it was already there and I just helped it along

I printed a new upper piece and I’ll be putting it back together tonight most likely.