The squeakiest pogo stick ever!

I bought 2 of these pogo sticks and I can't believe how squeaky and noisy they are! Why do they make these things with the inside spring rubbing on the metal casing and impossible to get to in order to oil? Poor design.... have any of you listened to a squeaky pogo stick for hours at a time? Ack! Does anyone know of a brand that is quiet?

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