Just get a 309 alignment template and be done with it...
It's $20 here:
http://www.needledoctor.com/SME-model-309-alignment-protractor
It's what I use and it's simple, accurate, and accounts for the variable pivot-to-spindle distance sliding base.
Tom
It's $20 here:
http://www.needledoctor.com/SME-model-309-alignment-protractor
It's what I use and it's simple, accurate, and accounts for the variable pivot-to-spindle distance sliding base.
Tom