In many cases j, but not many times also. By the guys' post, he indicated tuning a bow was not necessary at all.

With fixed blade heads, most times a little tweaking is necessary, almost always if you want them to hit with your field points......but that was not my point of this thread. I see a few bowhunters who use mechanical heads as a means to avoid tuning, and to me that is not the best reason to use any head no matter what kind it is.