Grease the rails very very lightly. I also found the metal clasp underneath rubbed slightly on the top of my seatpost, less than 1/8th of a turn to tighten got rid of it
@TooTallTim started
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Grease the rails very very lightly. I also found the metal clasp underneath rubbed slightly on the top of my seatpost, less than 1/8th of a turn to tighten got rid of it