Detail of the Synchro Hub
You can see that the "dog teeth" on the synchro hub (the tiny ones) ore rounded. It's not as bad as I'd imagined, but according to a local expert, the hub should be replaced. You can also see a groove worn in the synchro ring, the metal part under the teeth. As it happened, the slider teeth were in decent shape. I have another slider that's nearly perfect, so I'll use it instead. So, I need a new ring, hub, and probably the $100 tool to replace it. Sheesh!