Quote Originally Posted by DoulosDS View Post
I suspect the most likely problem will be how to attach a magnet to the motor shaft. The photos don't give me much hope at the armature end of the motor, unless the magnet were very small and could be glued to the end of the shaft with a droplet of epoxy. I'll have to open it up to see if the gear train provides a better magnet mounting opportunity. Maybe the gear on the output shaft will have a suitable spot. It will be a few weeks before the pump arrives here from China, so I won't know until early May.
Depending on the stator/rotor confuguration (and whether it is brushless or not) you may even be able to sense the rotor rotation from the outside, without attaching any magnets... Something you could test before even attempting to open it and attach a magnet anywhere...