Just a novice here but grease , to my way of thinking, is the only appropriate lube for mainsprings.
Ain’t gonna leak into the rest of the stuff where watches are concerned. It’s kinda sealed in the
spring barrel. And that spring’s windings, coil upon coil, need to slip effortlessly.
If they stick or bind, the powertrain to the rest of the movement will suffer.
I’m waiting for my order of watch oil to arrive. Used in the most delicate parts, Balance pivots, etc.
Starting to realize that over-the-counter oils don’t fill the need. School of hard knocks…
Can’t wait to get this 1888 vintage movement ticking again !
Duh! Broken mainsprings assume strange positions.
Still learning… #2203 replacement workes fine.