dburke, I'd avoid solvents or power tools in favor of mechanical removal by hand.
Best to clean off old glue/adhesive completely from all mating surfaces.
Not mentioned or pictured in your OP are the shock mounts and screws, dburke.
And the lines that you noticed demarcate seasonal growth rings present in solid beech.
Top is likely plywood with solid, lipped edge banding Possibly walnut.
Oh, don't get me wrong, Reamie.
Reamie, well before it seems possible, you will have to let go of that child.
Not a true Viking funeral, perhaps. But maybe close enough.
Seems like you're inferring it's a design issue then, Leif.
Assuming the chair had indeed broken, thus inspiring modification that we see in spanky's find, it would suggest a fa