In the olden days when I was a kid, the method for adjusting wheel bearings was to put the valve at the 3 o'clock postion and let the weight of it carry it to the 6 o'clock position with a couple of swings to and fro before coming to rest. Provided there is no play in the bearings, this is a good way to set up for minimum resistance. The back wheel was done tha same way.