How do you work on the loop end main spring on a Centurion 35 day clock? The spring just came off I believe.
I really don't understand your problem. A loop end spring is normally fitted over one of the posts that secure the clocks plates together. I cannot visualize a circumstance where a loop end spring could come loose, in an assembled clock, without the spring breaking. In which case you would need to install a new mainspring. If you can send me a digital picture of the condition.