I carry a slice of an old credit card for this. It sits un-noticed in my tool kit until, once in a while, I really need it. Not foolproof, but it works more often than not.
I also carry spare fork seals. Yeah, most seals can be found almost anyplace, but they don't take up any space and it can be really nice not to stress about looking for new ones.
Hope that's helpful. Two threads in as many days on leaking fork seals in far-flung corners of the world: must mean something.
Mark
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