And after I just promised myself - positively not one more standard typewriter until I get rid of a few, and $56 shipping to me at that!  Still my heart goes out to it since I am enjoying my Remington 30: its imprint is never going to look like an SG-1 but at least it prints its uneven letters in even rows, I have to give it credit.  Is this Remington 20 even complete? It has the palm tabulator but not the front mounted decimal tabulators seen elsewhere on the model.

I like a challenge, but I would find restoring anything with this level of rust too disheartening, surely rust acts like an abrasive and would make almost every part in the typewriter beyond repair? I would just prefer to find one in better shape that still requires work.

155 Euro Javi?  You are excused, sir.

Rust is not particularly abrasive, Platenboy, but if the word you were looking for was "erosive" then yes, it is the nature of rust to erode metal: rust is the loving and patient caress of the biosphere slowly lulling iron back into an oxidized sleep. It's the price we pay for that damned oxygen we like to breath.  

The rust does not actually look that bad to me - though of course we cannot see all part of the typewriter. What we can see is almost all of that shallow variety known as surface rust which means there has not been significant material loss, the only exception I see is the front of the margin setting rail to the photo's left.