I don't personally think it makes a difference, but, some may argue. It seems that the split rings add another 'pivot' point and allows the spoons to flutter a bit more because you're not restricted by the size of the swivel. The spoon's pivoting around this little circular ring instead of this large, rectangular swivel.
I don't know. If it doesn't come with one, I don't bother putting one on. It's not a big deal to me..
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