One purpose of recolleting is to align the point that spring leaves the collet with the stud, obviously collet center is to fall on this line of alignment. In case the collet already aligns Ok, but it doesn't fit the staff, broach.
I have seen collets just glued to the staff when its hole is too big.
Thank you @nickelsilver !
Definitely close! The differences may just be superficial/decorative (differences in train bridge and balance cock shape). For me, the question is if I'd find the exact spare part for the exact movement (balance staff, ideally with spring or even entire cock). Or if I should just find another movement entirely that fits into the watch. The Lorsa 514 would then fit well (by it's external dimensions) and it's dirt-cheap on eBay.
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