Ok! Now I get it! Thanks again!

Great way, pz! You line up the "X"s in the two layouts! Thanks!
But how do you apply them on the board and don't lose the accuracy you already have?
I'm really excited about this method of yours!

Thanks for this great project, pz! The knob controls make it look very versatile!
Can I ask you something, though? How did you manage to etch a 2-sided board?

Hector