The Phil Wood 26dpi cups are sounding more and more interesting. But I am going to try jamming/force screwing in the 24tpi plastic cups first. I have to take the bike to a shop soon. I have had no luck taking the fixed cup (drive side) off the frame. Don't have that 16mm (5/8in) open wrench. It is also left-hand thread. right?
phatatude, no, I can't cut off the lip to make the cups go inside the shell. The fastening notches are on the lips.