I'm considering switching moderators to something lighter than a northstar. I tried a friend's Atec CMM4, which required a lot more effort to tighten the final few turns than my existing moderator. The screwcutting was done by Steve Kershaw, so I've no concerns about the workmanship. The thread is 1/2 UNF.
The paperwork from Jackson Rifles mentioned that there should be a degree of play until the final tightening of the moderator, and if this isn't the case the thread should be recut looser.
Your views would be appreciated, as I don't really want to bother having the thread altered.