Hi there,
I've noticed whilst testing 'Electric Technic Motor 9V Geared 480rpm' (47154) http://peeron.com/inv/parts/47154, it was making a strange buzzing noise whilst going both clockwise and anti-clockwise.
Could this mean one or more of the internal gears are failing? Thankfully, there are four thin screws on the bottom which allow the motor to be taken apart.
Are replacement gears obtainable? If not, then I have to have them either 3D Printed or cast in a silicone mold.
Thanks.