Jordan,
It sounds like you already trashed the plastic piece. If so, you might consider going to a Lowes or Home Depot, etc. Pick up a piece of plastic hose (appropriate diameter) and cut a section out of it. Fashion it to fit like the original. Worse case, you wear it out quicker than the original, but with a 12" piece of hose, you can make a few more. I will bet the inside of the lever is probably worn a bit from the metal contact.
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