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I've temporarily mitigated this using electronic heat shrink/thermal fit tubing. Though that works pretty well, heat shrink isn't designed for long term skin exposure with sweat and body oils, so I should replace that soon, or hopefully find a better long term solution.
The glasses themselves were made in 1988, so replacement parts are basically out of the question.
Any ideas?
This was my first thought. An optical store would probably also have them.