I....
pretty much evoked some very good opinions on this recently, when I posted about "LUX suction".
The short of it:I thought my 1205 had dropped a little in suction & rpm. So...I had another 1205 ready to restore and rebuilt that motor along with the vacuum in question's motor. Identical sound and identical suction. Then....I went on to compare the suction of a restored G against the 1205....the G was the clean winner. More confusion....than what I started with.
We considered that maybe the chamber in the G was sealed better....I believe this to be true. I did buy a rpm counter, but not the air flow meter or suction tool yet. I'll get back into this later towards summer; 'the dueling vacuums'.
Kevin