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Hide glue is the glue of choice for this job, hide glue does not stretch, but it is tricky to work with due to its fast setting time
Using an overhead clamp and some wedges I push the wood to the desired shape needed to create a flat join.
2 hrs dry time between each location is sufficient
After all three areas have been glued and joined, leave it to sit overnight.
To fit the back cleat, we use simple magnets.
I tape one set of magnets into position on the outside of the guitar, this allows me to insert the other set through the sound hole and they will go straight to where I need them without any alignment issues
Hide glue onto the cleat
Magnetically held straight where I need it
Repeat for middle set
Placing the jack inside, we can provide some minner strength to the back
I fit all three jacks, the magnets indicate where the jacks are located as they are magnetically attracted to them
Working one area at a time, I fit some hide glue into the crack.
Repeat for back set.
As there are three locations, I will use three jacks
Internal view of Back Cleats
We need to make sure the two joined surfaces are flat to each other, so some small sanding is done over the join.