The discussion during the VIS meeting reminded me of this SRM BF keystone issue, which has never been addressed. After a brief discussing with Aso-san, I decided to redefine the keystone height of the SRM BF to +100 µm and the SRM F1 to -100 µm so to put the BF keystone in a slightly better position while not compromising the IM OSEMs range. I then ran a quick TF check of BF GAS and IM V to make sure they are free floating (I didn't save the measurements). Now, the IM V OSEMs readings gives V1: 5080 cnts, V2: 3380 cnts, V3: 3910 cnts, which are only slightly above the acceptable linear range.