collar bolt, a nut bolt and washers do a better job!?
Use some fibre grip/carbon paste on the post, you can get away with less tension on the collar. Seen a few newish frames where no amount of tightening would stop the post twisting.
@Emyr started
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Use some fibre grip/carbon paste on the post, you can get away with less tension on the collar. Seen a few newish frames where no amount of tightening would stop the post twisting.