For the record, following are the measured weights of the QUAD glass penultimate masses (PUM) and test masses that are currently here at LHO. Most of this data can also be found on the CIT optics Nebula we page. Note the labels of the masses are slightly confusing as the optics have been coated specifically for the one-arm. MASS LABEL INSTALL LOCATION 39,653g ETM02 (TM) BSC8 ITMy Didn't measure ITMy PUM because it was the first mass bonded and we were not wise to the need for weights. 39,626g ETM04 (PUM) BSC6 ITMy PUM 39,689g D050421-001 BSC6 ETMy PUM (was lasti mass) 39,613g ETM04 (PUM) 39,641g ETM05 (PUM) 39,633g ITM01 (PUM) 39,621g ETM03 (PUM)
I have reason to doubt the weight listed for ETM02 "TM" - I do not know where this number came from.