That celluloid binding is well known for shrinking, getting brittle, discolouring, cracking, and all sorts. There is about nothing that can be done to revitalize it. If it can be pressed back into place, you can use CA (Krazy) glue to tack it back in place, but it won't stretch back into a curve. It was originally held in place with acetone, or an acetone based glue, and acetone will dissolve the binding. It can cost a lot to have binding replaced or repaired, and doing so is about guaranteed to damage the finish at least a little.
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Brian Evans
Around 15 archtops, electrics, resonators, a lap steel, a uke, a mandolin, some I made, some I bought, some kinda showed up and wouldn't leave. Tatamagouche Nova Scotia.
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