So here's I have treated the crack in the neck. I held it up to the sky and found the end of the crack and drilled a 5mm hole. This should prevent the crack ever going further.
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Then I needed a way to open the crack a tiny beit to get glue in, and also a way of clamping it together. I McGyvered up this device. With the nuts on one side, screwing forced the 2 sided apart, with them as in the pic it pulls them together. Seems to be working, glue squeezed out and is drying. I'll dowel the hole later even though it will be under the neck plate.
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