[Eljaro]

I do not really know what the third progression hole really did to the whole setup.
So much else was wrong with the jets, emulsion tubes and air jets when I drilled the holes that I noticed really little improvement. In the end, with all the other settings in place the third progression might have been very valuable. The only thing I can say is that the car runs almost perfect now, WITH the third progression hole.
So it will do no harm, that is for sure.
eljaro