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On 4/29/2021 at 4:31 PM, 1974 said:

I had well over a hundred red MMs and I've thrown out at least twenty. They just go bad and there is no cure.

Ever tried to fix them and succeeded? I found one in some bulk that worked for a short time. Opened it up to your pics to see if I could fix it. The coil side of the magnet surface had deteriorated a little, thin flakes of magnet where blocking the rotor, I lightly scraped the loose magnetic flakes off the top until the rotor spun freely and it has worked fine since.I love this little motor 

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2 hours ago, That_LEGO_Guy said:

Ever tried to fix them and succeeded? I found one in some bulk that worked for a short time. Opened it up to your pics to see if I could fix it. The coil side of the magnet surface had deteriorated a little, thin flakes of magnet where blocking the rotor, I lightly scraped the loose magnetic flakes off the top until the rotor spun freely and it has worked fine since.I love this little motor 

Yes the magnet powder is closing the gap in the wrong micromotors. But I am very curiosity how could you close back the motor that the metal connectors (brushes) did not damaged. For this we had a specia tool. two tiny needle was put to the holes in the buttom of the motor which pushed away the brushes from the rotor's segments. while the motorhouse was push togetherwith  the gearhouse.

Is The motor what you repair was Mini-motor or micromotor.? Because there were a same problem with the mini-motor's magnets. but Mini-motors magnets got a nickel layer and here much more easier to open and reclose the motor. And in the mini-motor there are nickel "flakes" but in the micromotors there are magnet dush. 

Edited by QQriQ

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I made a tool out of a rubber and a cut in half staple. I only have a picture of the magnet after I remove most of the loose material, and it was all the same colour as the magnet.

 

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4 hours ago, That_LEGO_Guy said:

I made a tool out of a rubber and a cut in half staple. I only have a picture of the magnet after I remove most of the loose material, and it was all the same colour as the magnet.

It is brilliant! 
Our assembly tool was "same" :-) 
There was a holder which hold the motor in good position. and one pneomatic which turn a little bit right when the tool upper side (where the gearhead with rotor was put) push them together. on the upper side there was a magnet which hold the gearhead in position.

 

 

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