Don't know if your interested or not, but I thought i might through this out there as food for thought.
I have a set of Edel. 6073 that I played with using a Dremel with a wand. Not saying you should, but I think it worked for me well enough.
Also thought I'd mention that along with your new springs, you really need to use either a spring cup, or a locator like the Comp Cams Spring Cups pn 4694-16 to keep the springs from dancing around and chewing up the heads. By the way, they fit around the guides great without any head mods, and seem to almost snap into the bottom of the beehive spring pn 26986-16. That aren't the ones you need for the solid roller mentioned earlier, but there better than stock Edel. springs IMO.