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Installing a new front tire and a Bikemaster tube. On the valve stem is a loose cup washer and two stem locking nuts. What's the purpose of the cup washer? Does it go inside the rim or outside under the lock nut(s)?

As with everything else on the left coast, Seafoam has been known to cause cancer in the state of California. You just need to cross a state line where you can bathe in the stuff without a problem.