Guitar pickup type, not piezo
Owner never realised his reverb was broken as 2 of the 3 springs remained
connected. So I will leave as is but with the loose one removed.
So I didn't take it apart to replace. Anyone familiar with the anchor
points, I'm just curious?
They look like small soft iron rods somehow soldered to plastic surrounds -
so I left alone. It was the 2mm or so diameter iron that had snapped about
where it passes through the laminated iron surround of the pickup.

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Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/