I have orderd repacement G Springs

In the meanwhile, I found printed pages of the rebuild steps that might be helpful

https://drive.google.com/file/d/1q0X...ew?usp=sharing

for instance, the print pages show two helpful tricks
1. just clamping the shifter upside down on the end of a handlebar tube to immonbilize it and free up one hand. (why didn't I think of that)
2. using opposing allen keys top and bottom to unscrew the fixing bolt
3. using an allen key to push up from the underside (instead of a finger as show in the video, which is VERY clumsy)

Peter