The organ have 172 springs :
56 springs for the grand-orgue pallets
- 56 springs for the positif pallets
- 30 springs for the pedal pallets
- 30 springs for the pedal mechanism
They are made with 1 mm inox wire, for the mechanism springs and 1,5 mm inox wire for the pallets springs
Having found the good strength by means of a spring of test, this one is reproduced on a paper so that all the springs are identical.
The force required to press down the keys is about 120 grams
I realize at first an elbow in 90 °
The elbow is hung on the spring machine
We turn the crank
After three tours of crank, we obtain the buckle
One spring ...there remains 171 ...