As an alternative to the Mint protractors, I recommend Ken Willis' arc protractors. The one he made for my JMW 10.5i has separate arcs for Loefgren, Baerwald, Stevenson and VPI alignment, is much easier to use than the Wallytractor I borrowed for a previous arm, and cost just $50 plus shipping. You can reach Ken by searching over at the Vinyl Asylum of AA (his moniker there is kwillis). No affiliation, just a very satisfied customer. Dave