From what it looks like, Kershaw lubes the heck out of the 1560 and 1550 folders (Whirlwind and Black Out, respectively). I guess this is why they are so smooth. As to the torsion bar, it does not require any care at all. It's made of stainless steel so it will not corrode and is specially shaped so that it will not weaken over time. Just treat the Onions like any other regular action manual folder.
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