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It’s not a clutch as such, it’s notches in the barrel wall that the end of the mainspring lodges against - when the spring is fully wound the end drags along the barrel wall and snaps into the notches as it passes. Try letting the watch wind down for 24 hours (i.e. without wearing it) and see if it still does it when you unscrew and then screw the crown back down.
Regal
PawG
Mechanical question - I have a diver watch with screw down crown. It has a Sellita SW200 movement.
Today I had to adjust the time (travelling) and I noticed a weird “clicks” while screwing the crown back down. Didn’t think much of it but then I remembered and tried it again and it actually doesn’t feel good. It feels like when screwing down the crown there’s a resistance that I have to push through. Not all the time but every turn or so there’s a click. I’ve done some quick research online and some people say it’s a poor design of the Sellita and can actually damage some teeth somewhere. Others say that it’s the clutch when the watch is fully wound. I actually don’t know what to think of it, the watch is basically brand new, still on warranty and all I’m just wondering if it’s normal. To my pedantic ear, it does not sound healthy. Anyone experienced this before?
Oh, I have another watch with the same movement, but without the screw down crown and never experienced this with that one. Odd.
Cheers