Well... umm... FU too...
Reading about washers... I read of paper thin washers that you wouldn't think would make a difference- but have huge consequences... I have a set of brakes that a washer was missing from- I thought it would be totally easy to source another one- I was very wrong. It had to be exactly the right size.
Congratulations! It's always rewarding to figure out a solution to something that's "had" you for a while.