Picked up a cheap DC24 that works fine, but makes a strange sound when it is turned off. As the motor dies, it emits a kind of groaning sound.
I investigated and noticed that if I held the motor filter tighter against the motor, the sound went away. Without the filter in place, the motor sounds fine.
I swapped the filter for another one from another good machine, and it didn't make any difference, so it seems it's not the filter that's to blame.
Any ideas please?