Is it a cone with a spider bridge or a biscuit bridge? In either case some structure needs to be built. The big hole from the cutout needs bracing. I add posts around the hole (5 or 6 will do). And a strip of wood cut like a gasket for the cone to sit in. You have to get the cone to the right height for the bridge to line up with the finger board. The wood ring allows for the height and makes a seat for the cone. The cover plate screws over the cone to the edge of the box top. This is all shown in how to vids on YouTube.
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