Here are my notes on this from a few years ago. Again, whatever you do, DON'T use a solvent. If the piece is that bad, you need to send it to Gordon Christman. To tape the pieces back together, you can just use 1-2 2" small pieces of archival hinging tape. It isn't necessary to tape the whole length. https://www.dickblick.com/products/lineco-document-repair-tape/