Neu 1512, 1.5d magnet force

I just recienve my Neu 1509, 2.5d t my 1512, 1.5d.
Like all my other Neu that i had, the 1509 rotor is very hard to turn by hand, but on the 1512, the rotor is very easy to turn by hand, like if the magnetic force was not as strong as the 1509 or my previous 1515, 1y, and 1515, 2.5d.

Is somebody here have a 1512 and have experiment this??

Thank you

[Arct1k]

Since about April Neu changed the rotor design such that it is easier to turn over... Several people have reported this...

Arct1K, i think you're right, because on my 1509, the manufacture date is 4/23/2008 and on my 1512, it's 5/20/2008.
So if you're right, my 1509 have the old style rotor and my 1512 have the new style one.
I can see by the back cooling holes that on the 1512, the gap between the rotor and stator is more important than on the 1509.
Hope that the performances will not be altered.