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1965 Silvertone Harmony model S1478
With Original Fibreboard Case
~ Page 44;  Guitar Case Work page 2 of 4 ~
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Clamp at the assessory compartment is clamping the reglued compartment walls to the case sides, with new brads tacked in to replace the staple brads that long ago fell out.
Here the highly dampened paper towels can be seen, as well as being able to visualize the different lengths of paper towel padding on both sides of the lid lip under the outer paper towel, to make the lid lip conform to it's original curve..
Another view of different thicknesses of layerd paper towels used to form curved pressure against moistened / glued / remolded curved surfaces.
Shown in the pics below are good views of the paper towels wetted with water and wrung out damp before applying to the case surface to dampen the fibreboard right through the old "tolex" covering, which will make the fibreboard reconform to the clamp molding.  The ability to do this with aged case coverings is highly suggestive that these old fibreboard cases must be resealed with a spray on finish to make them reasonably water resistant again.  ~~~~~~~  If a person doesn't know or understand the dynamics of spraying down successive very light coats of finish, so that the case's fibreboard and covering doesn't become wet and distorted, then the job is best left to someone who knows how to do it.  Most reputable amplifier retorers know what sprays work good on coverings, as do luggage repair shops.  And automobile paint shop that knows how to restore vinyl car tops would also understand the process once they see an old fibreboard case.  ~~~~~~~  Should someone desire to give a try, then they can email me and I can provide detailed instructions.