You must be missing something obvious, since this is not the first time you've done this job....are you using all the original pieces you took off prior to the powder coating? If you changed things that could be the problem, or have you forgotten any parts? I had trouble getting the adjustable cup on my AO-8 to have enough threads for a lockring when I reassembled it, turns out I had somehow managed to add a spacer under the fixed cup that wasn't there originally (I assumed it was since it was with the parts when I went to put things back together...). Spacer removed, no more issue.