I'll be honest with you, while it is possible to rebuild and repair those, they have a finite life and do not take well to amateur rebuilds. I'd buy a new freecoaster if I were you. The steel FEC if money is tight and the titanium if you can swing it
Ares send me an exploded view and said separate 7 and 9. Then tighten 2-7. I did that and then experimented with various amounts of grease (and no grease) all over different parts to try and figure it out. I'm back to where I started with quick engagement, but no freecoaster. There must be some balance of the drag on everything that takes the 'just right' amount of grease. Also possible I messed something up. Either way this thing it too janky and I think the advice to upgrade is the right path.
I am still learning how to set it beforehand