During the maintenance break of today we loaded the SPRB link with a ~20 kg sand bag trying to change its vibration frequencies and then look at effect on the ITF, to be checked in the following.
The 'sand bag' was positioned at the level of the SPRB window separation, and if convenient could be put in another position along the pipe itself.
We are preparing a 'leg' to be installed in between the link and the concrete floor, in case we want to test a different configuration, possibly more stiff and effective.

This will likely produce disturbances on SPRB minitower controls and needs some compensation, as reported by A.Bertolini;  to be coordinated