I've read that because the loose balls don't have a cage to keep them separated there's a little bit of a gap. Some gaps are big enough for one ball and others about half that size. As long as you have the correct number of balls I think you should be okay. ??
You could probably google it to see, but we can't post copyright material. if it's available free I don't see why not... but someone else will probably have a better idea.
wow! She looks to be in fantastic shape.
I'm no good with electrical myself. I can trace wires and match color-coding... that's about the extent. I'd say post up your individual questions in the workshop section to get more response. Or you could start a project thread.
Good gawd man! That sounds like an absolute nightmare! Glad you can move again and hope they get it sorted ASAP. You've had a CT scan on your neck then? I'd be worried your spine is getting pinched.