I have had no problems with that, interesting. undo the clamp again slide it up a little clean the shaft, apply some silcon and see if that works. You may need to open the clamp (the square thingy on the top of the clamp spread open more with a small flatheaded screw driver) a little more and bring it a notch tighter to seal it.

al

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One Ruby, One Grand Cherokee, One YJ, One disassembled CJ, one Chevy Mason dump, one hotrod IH Pick-up, couple of antique tractors.
Former owner of a 5.5 inch lifted KJ