We had to take a photo of this rim lock. Mainly because over the past 30 days we have done several and didn’t get them photographed.
Many of these old rim locks were made with all solid cast brass components that wear over time (to a point where they do not operate). We often build up silver or reinforce parts with a tougher material to prevent or delay additional wear. Often we are able to do these type of projects (for exterior doors) the same day.