Please can I remind all TMS operators and anyone using the TMS lab to take due care when using and putting away the TMS coils. Today we have found that four of the tracking spheres on the coil trackers needed replacing. The retroreflective surface on the spheres is delicate and will wear if touched or knocked. This will lead to inaccurate tracking for your experiments as the centre of the sphere will be misestimated by the Brainsight system. Further, this suggests that the coil trackers are getting knocked which is not ideal as these are delicate, precision instruments.