Here a few other options you may want to consider.
Read the link below for another trigger wheel option. This eliminates any after market potential issues (but may introduce man made error so be careful ??? ). Instead of using the 6 degree layout, protractor and punch that Jeff talks about, i had another trigger wheel laying around that i matched up with the OEM used to determine how much to file off the key. This will make more sense when you read the link below.
http://www.jkozloski.com/Trigger.htmHowever with the ECT Timing mod in shoptalk, you can eliminate dealing with the trigger wheel altogether.
http://www.valkyrieriders.com/shoptalk/ect-mod.htmJust food for thought.
