Cascade Fathead Ribbon Replacement Service
This Cascade Fathead came in for repair sounding not very happy.
A peak inside shows a ribbon mic that was likely subjected to some close proximity, loud guitar amplifier.
A closer look at the excursion shows what happens when ribbons are subjected to too much air movement. The ribbon is pushed against the screen to the point where the corrugations are removed, and the ribbon takes on the pattern of the screen it is pushed against.