Greg, Jim, Hugo,

One could hear/feel both of the top mases resonate when being hit. We moved both masses and set them on a different set of washers (we used the same kind of washer as for the previous units). We adjusted the masses/wahsers position util we could not hear/feel the masses resonate anymore.

TF are running overnight. Hopefully, the unwanted resonances that were recorded in HF are now gone.