I use a vacuum mounted vice from Harbor Freight to hold the bases of my Kayfuns when I rebuild them. It has rubber inserts in the jaws and you can adjust it to any angle you want.
Works great.
http://www.harborfreight.com/2-3-4-quarter-inch-articulated-vacuum-vise-3311.html
Works great.
http://www.harborfreight.com/2-3-4-quarter-inch-articulated-vacuum-vise-3311.html