The helpful guy @ Moog did specify they're 1/2-20, yes. Just really annoying when I burned a vacation day to get a jump on my list of projects and now that one has to wait on my stuff to show up and a trip to Fastenal.I got a bag castle nuts from Fastenal for like $3. Think its 1/2-20. I had a couple strip out when I removed them. May have been over tighten by the last person working on it.
But, if the worst thing to happen to me today is that I can't get my toy put back together when I want, then I guess I'm doing pretty good. Just wanted to point that out for anyone else going the Amazon route. Might be worth the couple extra bucks if you have store nearby.