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I did the job today. I found that the flat brass detente springs, the large main one and the smaller one alongside it, were catching quite hard against the plastic parts which they ride against. I cleaned off the old waxy grease and relubed them. They still clicked too hard for my tastes, so I got underneath the large one with bent needle nosed pliers and took some of the spring out of it by forcing it up and away from the plastic part. I did this with the other smaller detente spring also, but to a lesser extent. I cleaned and relubed the rest of the moving parts at their points of contact and reassembled. The signal switch now moves much more easily, almost too easily.
Edited a few days later: I had to take it apart again and put most of the springiness back into the two springs. I found that he feature where you slightly push the signal arm for a temporary signal during a lane change was not returning back to the off position and would sometimes stay on flashing, or even stay on with a solid light (not flashing). I think the larger of the springs was more important for this to work properly. So now I'm thinking that the cleaning and re-lubing was more imortant than the bending and I would recommend minimal bending of the springs, if any at all.
Thank you to everyone for your advice.
Thanks for adding the additional info. Very useful. Keep warm!