I know the feeling man, I had my knee cap, femur and right foot busted in a million pieces
from a car crash a few years ago and the knee is by far the most problematic. I´m young
and fit and recovered pretty well but it still gives me grief when physically pushed.
Get well man.
Regarding the spring, I thought I´ve read somewhere that they tend to break?
Maybe it was from the shift shaft. I have to go through my rebuild files to check it.