Originally posted by lakota
Typhoon,

If all you have to extend is a couple of inches, then JTR makes a part that moves the rearend back (or forward) a half inch. You can make the same part and extend it more. It's just a flat piece of 1/4 plate with a hole in it for the spring guide pin and a pin mounted a half inch back. No need to drill and re-locate your springs.
Neat, and thanks