Once the model of the instrument I intend to build has been chosen (Il Cremonese) I begin by assembling the corner blocks, formerly made of willow or poplar, here made of spruce. To do this I used a special tool (the mould): the mould has recesses on the tips of the C-bouts both in the upper and lower part where, after having squared the various blocks, I will glue them with a few drops of glue.