Hello Al,
Yes U are rigth...but the quest is to obtain maximum amount of HHO with minimum current (U have around 60Ah in a car batery...) -
U may try with 10 plates . One pozitive, one negative, and so on. The space between plate around 1 mm, if possible.
Some people recomand 1 pozitive - 2 neutral - 1 negative - 2 neutral - 1 pozitive (central electrode must be negative if the electrodes are cylindrical).
First of all, the size of electrodes depend on the housing of the generator. Leave at least 2" (~50 mm) space between the water level and the upper end of the generator - electrodes must be sinked in water (electrolite).It is recomended that the surfaces of the plates not to be very smouth to increase the surface of the electrodes (use sandpaper). Use alcohol to clean the electrodes before sink the electrodes in water.
Regarding the holes - some people didn't recomand to dril the electrodes at least for the negative electrode.
See U on forum...
Sorry for my english...