I made the modification so that it is easier to level the nozzles.
I have removed the Corrugated spring washer.
The lock nuts keep the wooden parts of the printhead together.
The lock nuts have just been tightened, allowing the thumb bolts to rotate freely.
In order to enable the assembly of the cooling fan I made two spacers of washers.
The cooling fan is attached to the aluminum plate from below with an 8 mm bolt (I'm not entirely sure, but it can also be a 6 mm bolt or a 10 mm bolt).
Adjusting the nozzles:
Pull the bowden tube up slightly.
Raise the s