The second attempt was quick and easy
2 pins are a lot easier than 5.
Knowing the bittings also helps. Since I removed the small master-key pins this lock has a very flat bittings, except for the last pin.
I was able to open the lock in less than an hour! I was really surprised when the key turned.
After that I added the last three pins and finished my first working key.
The trick was not to file too much: just a stroke to clear the mark(s) and then jiggle again.
It was a rainy day so I decided to go further. I took the other cylinder and started directly with five pins. This was a 6 pins cylinder but was filled just with 5.
I was a little tired from the previous one and the bitting was deeper, so this one took two hours.
When this key started clicking I felt a little emotion. After a few minutes it turned!
I finished the key with some sandpaper till it stop revealing marks: now it turns smooth in both directions.
Here are some picture of the locks with their just made keys.
There's still the other 6 pins cylinder waiting for me... now I'm ready.