The best fix is to avoid corruption entirely. Here are legal sources that provide clean, watermark-free, multi-platform PDFs:
The worst PDFs have the inner margins chopped off, making the system of each quartet unreadable near the spine. The best fix is to avoid corruption entirely
The fix using Briss (a free, Java-based cropping tool): The fix:
Many corrupt Volume 2 PDFs shuffle the order of the quartets. The correct sequence for Volume 2 is: The best fix is to avoid corruption entirely
The fix: