They stuck and the "butterflys" won´t move anymore.
Special thanks to eddie from our german forum who has gone through that short time before me.
The reason for the defect is a chrome surface on the magnet which will come off sometimes.
Then the motor won´t move enough or at all and the butterflys won´t either.
You can easily repair that by disassembling the motor, no special tools needed.
You can remove the spring on top if you like, but there is no need to.
If you do so, be carefully not to brake the plastik where it sits.
Cut that 4 plastiknoses to remove the back cover.
Partnumber
Here we see the cause, a lot magnetic crumbs
Lift the lower spring from its mount carefully and don´t brake the "ring" as I did - it is no ring
Then lift the cab very carefully
My fault
I marked the position of the cap and the axle, don´t know if important later
Now simply press the axle/ rotor (but again - very carefully. It suddenly flips out quick once you got over the magnetic power which holds it)
The rotor with the damaged chrome surface (and a little bearing, don´t loose it)
Now after I cleaned all up. I used a cloth first, then compressed air to blow all the chrome and ferric crumbs away.
By using compressed air pay careful attention to protect your eyes from flying particles !
clean rotor with bearing
Next step is to find a suitable color to protect the magnet from wareout as the originally chromelayer is lost.
