The soundboard and bridges were originally glued into piano with hot hide glue. This glue has been around for many years and is actually made from animal hides. It is quite strong, but is easily reversible. This makes it possible to remove the old glue residue after breaking out the old board, and breaking the bridges from the soundboard. The first step is to use a chisel to remove any wood that is left in the glue line. Then the old glue reside can be removed. We accomplished this by making the old glue wet with a solution of water and wall paper remover. The solution is allowed to soak for 10"-15" on the old glue line, and then the residue is easily removed with a scraper. It is a bit messy as the old glue rejuvenates when it is made wet and becomes quite sticky. The wood parts need to dry overnight before you can continue working.
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