After OFI shroud was put back on Mitch and I unlocked HAM5 ISI. Shifts from the range of reference position were all less than 7urad. Looking at trends CPS RX and RY locations changed up to 15 urad while the OFI work was being done and the table was locked. I will change the reference postion to be in the middle of that range, but should be very close to where the table is hanging now.