833 OD sticking in 4th, chipped synchro

To follow up, it's back together and back in the car. All 4 gears plus reverse work in and out (at least for the 5 miles it's done so far). Reverse was a nuisance until I realised I had flipped the lever over. Doesn't work that way. Fingers crossed it lasts another 20 years before I have to redo this.

I appreciate all the assistance.