833 OD sticking in 4th, chipped synchro

For those playing at home, the lever moves 1/2" in either direction. Same on both.

After trying very hard to keep the problem strut assembly together so I didn't lose track of what bits caused the problem, I finally caught it doing the bad thing. Which leads me to the part that I think is causing this, that I probably would have sorted if I had actually taken the keys out earlier. What's happening is that there is a concave divot where the key is worn on the bump part. The wear is from the slider at the end which is a point. It has carved a dish in the key. When the slider moves to the middle of the key, it fall into the carved hole and the key pops up. Not the extreme pop up, but it pops up. And then the bottom end or the key smacks the synchro.

So I'm going to get all new keys (never did replace those at the previous rebuild) and the one synchro. Fingers crossed that sorts it all out.

Thank you for the assistance.