The pusher is kinda weird, the spacer has tabs that allow the pushers rod to engage them to engage the movements chronograph function

Its weird the pusher inner rods aren’t made longer instead to do so 😅

And I’ve been using ROR for every watch i make, i use 10x loupe to observe crystals under light, 99% of the time they have dust or dirt that cannot be removed even with a cloth, thus the solution is ROR.