I sure hope this does not go the way of an Oil Thread...Here goes.
Having tried several ways to check wheel alignment I believe I found a way that is the easiest and perhaps most accurate.
After doing the parallel string method. The 7 foot long angle iron on each side method. The chain alignment tool method. And of course the factory marks on the swing arm. After trying all these I dreamed up the following.
Someone gave me a laser level as a gift a few years ago. Hardly ever used it until now. Wedge it against the sides of the tire to create the rear wheel alignment plane. The beam then projects it forward.
The trick is to move the front wheel, side to side, until you have an equal distance from the front of the rim to the beam and the rear of the the rim to the beam. After I did this with a tape measure I decided it would be easier to just mark a dowel. Do this on one side of the bike, then do the other side. Move the rear wheel adjusters so the distance from the beam to the rim is equal on both sides. Now your wheels are in alignment.
High Tech Okie Engineering at it's finest. For you pilots out there, this is way easier than the cat, string, and glass of water IFR method...Lol.
The following link is excellent and will splain it so it makes sense...even if you live in Rio Linda.