(I could be out of date on this or wrong - I've never owned Eclipse blades.)
AFAIK, "thinline dance blades" are only thin at the bottom, not on the places that your sharpening tool gap would touch, or that a professional machine tool would use to hold the blade. At least that is true for both of the Dance models I have used (MK Dance and Ultima Matrix I Dance). Instead, a thin strip near the bottom (the "chome relief region") is ground extra deep, more than is needed to remove the Chrome plate layer, to make that part thin.
When I spoke with the main sharpener at Riedell some years past, just before the Eclipse line came out, I got the impression Riedell was trying to imitate the MK line of blades in many respects. Though I was later told they took over the production line that had been used for GAM blades. But I can't confirm this pattern for Riedell Dance.
Do you know anyone with Eclipse Dance blades? Take your micrometer or calipers to the rink - or maybe just your Pro-Filer.
In any event, you could line the gap with tape to make it thinner. A bit hard to do, but possible. Or put thin lines of thin tape on both sides of the blades themselves.
Last I heard, Eclipse blades are not pre-sharpened at the factory. I.E., they have an infinite ROH. So, unless you want to wear out the coarse (diamond dust) cylinder on your Pro-Filer, or use another tool, you may want to get a (good!) skate tech to give you an initial sharpening. Just be sure you record the profile first, so you can restore it, if you want. You may want to tip the skate tech - it will take him a lot of time to create that initial ROH, from nothing.
It is common to have a slightly smaller ROH on dance blades than freestyle blades, because they are thin, which means you need a smaller ROH to create the same edge angle. That meant I had to go to 3/8" ROH instead of the nominal 7/16", because Pro-Filer doesn't offer 7/16". (Or rather, they do, but the nominal 7/16" ROH tools are actually 3/8" tools! The Pro-Filer creator claims it is a very small difference in shape, measured in terms of depth of the depression. He is right, but I believe it does significantly affect the edge angle, and the sharpness I feel.
BTW 3/8" ROH blades should have a slower and shorter glide than 7/16" or 1/2" ROH blades, and they should require more frequent sharpening. So if you can get away with 1/2" ROH (depending on your tools, and your skating skills, of course), you might try that. OTOH, I believe Dance places more emphasis on rapid, complex and clean turns than freestyle, so you might not get away with 1/2".
If you can get away with 1/2" ROH, as I mentioned before, you could switch to the old Berghman sharpening tools (see eBay). They are in virtually every respect better designed: you can adjust the gap width; you can get close to the toe pick with better control; you can see what you are doing), and are much cheaper. The only problem with them was that the old sharpening cylinders were a bit coarse and crumbly. (Maybe coarse enough to do the initial sharpening yourself??) You could replace them with Pro-Filer's stones, or with other brand abrasive cylinders of the right radius. Also, they aren't nearly as pretty as Pro-Filer tools. But I do wish someone would make tools like that again, in a variety of ROH.
Hope that helps.
P.S. To some extent, it may be possible to adjust the gap width on your Pro-Filer by changing the tightness of the pin that keeps the cylinder in place - but I'm not sure if that was only true on the older Pro-Filers. Also, I don't think you can adjust it much.
Topic: Thickness of Eclipse Dance blades? (Read 3870 times)