Brushing began in HAM-9 and was ~95% complete by the end of the work day (which was a little early due to safety meeting). Only the fins remain to be brushed. There were a few problems with drills: three did not run for very long (less than 10 minutes) and then there was some difficulty getting a brush to detach from the chuck when a brush change was needed. The drills in question had been stored in N2.