It seems there's some sort of issue with the auto-reverse of my Olivetti Lettera 32 and I believe I've narrowed it down to an issue with the mechanism for the left spool. The auto-reverse only works one way as the pulling mechanism of the left spool never stops regardless of when the auto-reverse has been triggered so that it is the right's turn to pull the ribbon back. Every time I press a key, the ribbon always advances to the left. The right spool makes indication it wants to pull the other way but the left always pulls harder and forces the right to move with it.