tekno neu have a suspect clak clak when spinning

[BrianG]

Hmm. I can't imagine what would go "clack clack". The bearings might feel gritty if dirty, but other than the magnetic "notches", I can't imagine what it would be. The Tekno Neus are sealed, so there can't be any pebbles inside. Maybe a lamination on the rotor is peeling somewhat? Dunno, sorry.

I wouldn't open the motor and just simply call Tekno about it. No need to void the warranty, unless you can open and close it without any visible signs you did so.