I've seen that on cars in the past and I lubed it. But what I did was remove the end from the transmission, and the end from the speedo. Then sprayed some silicone lube in at the speedo end and turned the square piece in the middle. Sprayed a little more and turned more. I did this a few times then kept spinning the middle piece until the lube came out on the other end. I kept spinning it until it wasn't dripping out any more. Then put it all back together and it worked like a charm.

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