"The one you have marked with green is the Sleeve contact, it is the Ground. Next time don't buy a sterio jack. It will be a little less expensive and all you need. The Red one is the Tip, which is the hot wire connector. The one you are not…"
"Yes. I reinforce my four string necks with a 1/4 inch hollow steel rod. When I epoxy the rod in place I clamp the neck to my workbench with one or two credit cards under the twelfth fret area. I don't know how much backbow that introduces, but…"
"The biggest problem in soldering is not cleaning the terminals, wire, and iron. Use a stiff bristled brush and clean everything with alcohol, then don't touch it with your fingers. You will be surprised how well the solder flows."