Whoa dudes !!!!
This is the sure fire Froggy way
Loosen all but the top triple, including brake caliper mounting bolts.
Bounce up and down a few times on the brakes.
Bingo alignment at it should be!
Nip up all then tighten.
This works as fast as I am game to go on the 12 with no wobbles etc.
And bloody stringlines keep getting caught on the pipe, pegs stand etc.
If you plan on keeping your bike (who doesnt?)
Get a bit of wood as long as the bike, a couple of long up headed bolts.
You already know your wheel base and how wide the tyres are so it is pretty easy to get close before it even gets near the bike (if you are that way inclined).
Hope this helps
And if I am doing naything wrong here someone PLEASE tell me.....
Flip from one side to other and it is a one man job to get it "stringlined"
Set up for your bike, it is simple to use and works excellent.....
Finished "tool" should look like too capital F's joined at the base.
The bolts will be "shorter" in the back (once you get the right distance cut the excess off).