For the record, here are the weights of the glass optic, compared to the weight of the dummy we used to tune the suspension:

BS optic = 14,251g

Dummy mass = 14,180g

So, the optic hangs a bit lower in the structure than the metal dummy mass - Travis confirms this with the position error of the top BOSEMs.  We will correct this if IAS measures that we need to.

Also, FYI - a BS shipping cake tin weighs = 22,538g