The black mesh/gold film transducers on these sensors cannot be repaired if damaged due to dents or punctures:
Motion Detector, order code MD-BTD, $89
Go!Motion, order code GO-MOT, $124
CBR 2, order code CBR2, $99
To avoid such damage, we recommend protecting the Motion Detector when doing simple harmonic motion experiments where weights are suspended over the sensor. A simple wire in-basket can be placed over the Motion Detector to protect the sensor without introducing interference.
The transducer on the Go Direct® Motion Detector, order code GDX-MD, $99, however, can be replaced in the event of damage. Contact firstname.lastname@example.org or call 888-837-6437. Note that this sort of damage is not covered under warranty and there will be a repair fee.
Other tips for good results:
-Tape the mass to the spring so that it does not fall off.
-Do not pull the mass to the bottom of the cycle, then release it up. Instead, start the oscillation by releasing the mass downward from near the top of the cycle.