I have a Mint myself but find the linked to instructions for an arc protractor to be a bit better than Yip's, although I do like his protractors very much.
http://db.audioasylum.com/mhtml/m.html?forum=vinyl&n=738382&highlight=arc+protractor+instructions&r=&search_url=/cgi/search.mpl
http://db.audioasylum.com/mhtml/m.html?forum=vinyl&n=738382&highlight=arc+protractor+instructions&r=&search_url=/cgi/search.mpl