Rolleiflex WLF opening.
Upper close position.
Middle while opening/closing.
Down open position.
Here we have a big roller that is pressed by the hood against a blade spring being stable at both closed and opened positions.
The roller was not rolling at all on this operation because the grease was dry or no grease at all.
Cleaning and using thick grease solved the problem, now the roller rolls in the opening/closing and no more nasty sounds.