N Cook wrote:
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.

They usually consist of small tubular magnets glued onto the wire which
is soldered into the end of the brass tube. If you can get the magnets
off the wire, you might be able to replace it with some very thin piano
wire, but reverb tanks are so cheap, it`s not usually worth trying to
repair one.

Ron(UK)