Custom made protractors based on original manufacturer's geometry: http://stores.ebay.co.uk/legendaryaudio
Very effective and highly recommended!
Michell Orbe with Moerch DP-6 Gold Precision > Shure Ultra 500 / London Jubilee / Miyajima Kansui > Croft RIAA R / Miyajima ETR-800P / Audion The Converter DAC > Audion Premier 2.0 > Audion Golden Night 300B/PX25 & Audio Black Shadow 845 > Audio Nirvana 15" Classic Alnico with Tannoy ST200.