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@pharoahsanders
Dredge. I run Phil hubs and needed some new cogs, then saw in the HubJub thread that Will had a few EAI cogs left. So I asked him, knowing that he would know, and here was Will's answer. I thought I would post it for others.
"The upmarket EAIs with titanium nitride coatings -- SuperStar and GoldMedal -- are coated over the threads. This makes the threads tighter than the specced pitch. As a result, they are a squeeze on Phils, and pretty much impossible on Royce. Experienced and careful people can 'tap out' the threads by working them repeatedly over an old steel BB cup and I have several customers using SS and GM on Phil with no problems, but the fitting is difficult enough for me to advise against generally. Basic steel EAIs are fine on Phil. The BB cup trick is still recommended, as it is for every fitting."