Well, it's like this. The bow shops I ventured too over the years did such a crapy job, I was extremely pissed off afterwards. My first black eagle was set up by the owner on the store and it was awesome. My replacement black eagle was setup by his son, it sucked. All the other shops were the same results.

However, as I pointed out my setup now is within .01 mm. Vertically and horizontally on center. Unless you bow is twisted in the core, this is where you want the arrow to be. You can't eye ball that not even close. Which is why you need to adjust afterwards unless a core twist.

My arrows fly like darts with zero wobble and silence down range. An untuned bow will have arrows making noise that can be heard by a person or deer down range. You should try it sometime. Of course make sure you're well protected.

The point of my post beyond the beginner trying to do it themselves was to challenge folks who read this and question their setup. I've posted a cheap way to verify all the center measurements. I would love to hear from folks who find their horizontal off by at least 1mm to the left or right. That's the thickness of one dime. That's a missed deer in the woods. Tall tell sign? You're good at say 20 yards but back up 5 and your shots are off be several inches. Many try to blame the arrow on this type of miss. Same can be said with the vertical measurement.

Doubt me, by the caliper if you don't alreay own one and find out. NASA relies on them religiously.

Cheers!