Good morning,
After my research and the help of each other, I understood that there were no 7mm keys that I couldn't find.
There are simple screws for the brake levers or the gearshift lever and for the kickstarter an 8mm key that can be simply redone on the basis of the 8.7mm keys still sold.
Thank you all for your help, the gear change mechanism is now reassembled and working. The next step will be to test it during road tests. But it's not for now...
