We learned to do it from that YFZcentral link....
The worst part about it is that the stock shims are precise measurements, and the aftermarket shims are .005 increments. So you may need to buy a kit of shims ($85 ish) and use trial and error until you get the gapping right. Just make sure when you get the proper spacing finally you keep a log of the shims you have in the quad so you can get an idea what shims you will need the next go around.. You can pretty much count on using several different sizes each time you adjust them..
I wish you were in my area I would just do it with you. You could just buy the shims and labor would be free.
If you have any more questions feel free to email me at
tbolt94@yahoo.com and I will do my best to help out.