Yeah in your case it’s super fiddly work, and I guess every shifter is a little bit different. But the comment on the freehub really annoyed me, from what I gathered cleaning and regreasing a freehub used to be a standard repair. And not even that hard or long. I get that a new hub is cheaper than the 15/30min rate of a bike mechanic, but saying it’s impossible is just weird.
I have two bike shops nearby. My freehub body was on it’s last leg. And I wanted to repair it and use some new ballbearings. First shop didn’t have them and said the freehubs can’t be repaired. The other one gave me the bearings for free and sent me on my way with a „have fun tinkering“.
I think what they usually mean is “that can’t be repaired in a cost-effective way”… or “I only know how to attach new parts to a bike”…
But sadly, still a secret algorithm. But from what I heard, the DSgVO might help uncover it.