The rest of the case restoration story....
I decided to go with the 1/2" thick yoga matt and my wife picked one up at TJMax for 13 bucks and change.
First had to strip the gunk out of the case and surprisingly this was easier than I thought. I used mineral spirits and a plastic paint scraper. The scraper took most of the adhesive off. Had to soften some of it in a few spots with the spirits and then a bit of elbow grease to remove the residue.
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Next was probably the most time consuming part of the job....cutting a pattern of the body cavity with a light weight poster board.
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Trace the pattern on the matt and cut. Fit first time. Here's the insert cut and ready for spray adhesive. I got this idea from a previous installation of a headliner in an old truck. Gives a thin layer and sticks and dries extremely quickly.
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Sorry for the picture orientations. Next was to cut the strip in the top. Drywall T-square and a nice razor blade knife made this quick and easy.
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The case with the body matt and first strip glued in.....
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After fitting with the Patriot I added a second strip in the top of the case and a small piece to cradle the neck. this kept the tuning keys from touching the bottom of the headstock cavity. Perfect fit and here is the final product...
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And with the Patriot in place.....
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I'm very satisfied with the final product. The only thing I may add is a couple of strips of thinner foam on either side of back strap button since I do store the case with the headstock upright most of the time. I played with the idea of a yoga matt foam strip all the way around the perimeter of the body but there really is not clearance for it.