Luckily, I have an acquaintance/neighbor who is a sports physiotherapist specializing in soccer and basketball. He has given me some sessions and this has changed a lot. I will soon be almost 90% recovered.
The plane is now in the sanding, puttying and sanding phase.
The medication, the physiotherapist and the tool that the woman gave me are making the work progress even though I only have my left hand to work with.
One should not write anything on the Internet until one has already had a coffee and is waiting for the second one because neurons tend to play tricks...