Rubber tip on the brake rod

Dr. diff can keep them, 3 dollar part with $13.65

So $16.65 for a piece of rubber that fits on the tip of your pinky and that's if USPS doesn't lose it like lose everything else

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Cass does sell them on his eBay listing for $10 and free shipping. Shows out of stock at the moment.

Call him, I bet he’ll work with you on your shipping.