Went down to EX after lunch and locked the ISI, after Hugh turned off HEPI offsets. I had to move one of the witness plates on the floor, because I had to slide under the suspensions to get to the far side of the chamber. To reach the lockers, I had to steal a clean-er stool from the LVEA from around HAM5, as our regular in-chamber stools have been mis-placed, wiped it down multiple times, and foiled the base. Wherever this stool came from, we should get a couple more because it was the perfect height for this job. Slid nicely under all of the suspended obstructions, but tall enough that I could reach the lockers. I left the stool down there sitting outside the chamber in-case TMS needs it.