Guide spacing will be a little different for the different tapers of the rod, so that would explain the difference one finds at the different sites or by following the recommendations of manufacturers. True even in graphite rods, fiberglass or whatever. I found this source of information a few years ago, and while I primarily build bamboo, I have found this to work pretty good on graphite as well. This site allows you to enter the ferrule locations, then plot the guides based on a few parameters. It is always a good idea to run this, then tape the guides on securely, lace up the rod with line and see what the curve of the rod looks like under a simulated load. You can also use the site to mic the taper of the rod, enter the numbers and see what the stress curve looks like on a chart...pretty cool stuff.

[url=http://www.uwm.edu/~stetzer/guideN.html:8e28b]http://www.uwm.edu/~stetzer/guideN.html[/url:8e28b]