No one should be designing products in Illustrator, but if you’re a Mac user, you don’t have many options. Yes, a new version of AutoCAD just came out in 2011 for the Mac, but I have no training in it and it’s over $1000 for a non-student. Sooo… Illustrator CS3 for me currently.
Illustrator CS3 has an abysmal arc tool: you can’t specify an arc of a specific degree width. You have to manually build arcs of specific widths (in degrees). One kind soul has provided a mini-solution. Thought I’d share: