Upon request by Henk Jan, we removed a steel bar fixed on the bottom of EIB (1011g) close to vert3 actuator, and added instead a few bolts and nuts on the top of the bench (286g) close to the place where the steel bar was.
The thermal drift on the EIB is more likely related to the backreflected beam during the unlocked period of the IMC, the work in the laser lab for the replacement of a dead ALS photodiode was mostly carried on in the atrium. Actually, the temperature of the laser lab room itself did not experience a large excursion.