I edited the configure scripts (those called from the C1IFO_CONFIGURE screen) for restore XARM and YARM.  These used to misalign the ITM of the unused arm, which is totally unnecessary here, as we have both POX and POY.  They also used to turn off the drive to the unused ETM.  I've commented out these lines, so now running the two restores in series will leave a state where both arms can be locked.  This also means that the ITMs will never be deliberately mis-aligned by the restore scripts.