Originally Posted by
Dan Burkhart
There isn't much to go wrong with these things apart from the bearings. I wonder if people sometimes confuse the natural notchy feel of a dynohub with the way they sense crunchy bearings.
I have not ventured inside an SP hub, but I have salvaged an old Union hub which was a forerunner of the Schmidt and I did explore a Shimano just to see if it was possible to service the output side bearings.
Spoiler alert, it can be done.
Unless as you fear, the cups and cones are not salvageable. Then it is probably a no go.
https://www.youtube.com/watch?v=oXptXRqxj9c
That's a really nice video, Dan, as are all of yours. Clever use of the string and also of the three spokes and brass punch.