Which reminds me, how you going with it Jesse, haven't heard update for a while?? If you're still battling, try using a drift (~lump of flat bar~ 25 x10 mm?), and hit hard up against the underside of top yoke with a big hammer, or similar, on top of nut as resistance. This may require 2 people and a combination of some or all other options?
Another thought is, and I think someone else pointed out that if the bottom yoke 'pinch' is loose enough(?) to slide down and off the bottom, try that.....uhoh yeah remembered is the slider/springs/stuff still on, or can you dismember (dismantle)it??
cheerrs