Resurrecting this thread, let's see if anyone is watching.
I get some squeak as well and it looks like it's coming from the metal plate to which the spring is attached. It looks solid enough, no play I can detect except maybe for its own elasticity but when pushed or pulled (again, it doesn't move detectably) it squeaks as you change the force on it.
I can't tell where this plate is going/how it's fixed, if I can tighten anything or if there's anything to be worried about.
As it looks really solid I think the metal plate is attached to some other metal thing. But the noise sounds more like plastic/rubber so there might some gasket or the noise might come from some joint with some plastic part.
It is a LHD, anyone knows what's there?