Hi!
Well, what it worked for me were the following steps (overcharged with a lot of patience and wrist , LoL!)...
1. First of all, after a complete (in literal sense) dissasembly, cleaned each part with a soft clean cloth with meager amount of humidity.
2. Submerge all rusty components (rims, tension rods, strainer parts, etc) in White Vinegar (Acetic acid) during all night.
3. Then cleaned and repeat process if still remains some hard rust on it.
4. Dry carefully with soft cloth
5. After that, both shell and previously "washed" rims, should be cleaned with Brasso Chrome Polishing Cream, at minimun 3 times, making each "panel" (space between two lugs or holes) of shell and rims at time, and start with a old towel for example, and finishing with a very soft cloth.
Besides, of course, meticulously, clean and lubricate each mechanism and lug component (spring, etc)
Note: Pitting and Flaking are irreversible process, so, you only can control it, no eliminate it.
I hope this helps, let me know!!