I had to dissassemble my Neu 1512 because the bearings were not running smoothly anymore.
I also noticed that the endbell almost came loose on a few runs. The endbell is only pressed on. Which is rather dissapointing for a high class motor. The front bell/can is one piece. Some days ago after i had changed the bearings the endbell came loose for good and the rotor brushed against the stator.
On the other hand i noticed that on my Neu 1515 (Production date 1/4/2008) Neu Motors changed the design somewhat.
The endbell is now glued in and seems to be secured mecanicaly. There are some small marks around the can where the endbell sits. The bearings now are accessible from the outside. So i guess Neu Motors improved the design. The downside (with the new design) is my RC monster cover for the endbell will fall off.