"Glued" Cloth Reback (Spine Repair) 

UPDATED 8/12/2016: See this video with narration here: • Step-by-Step Guide to ...
This kind of repair is used when the spine if off/loose and the boards are still securely attached via the end papers.
This repair makes use of a library binding type of bookcloth, spine stiffener is 10 point folder stock that is adheared to the boards, adhesive is PVA.
Not appropriate for special collections / rare items.