I have a set of Realistic Pro II headphones made by Koss around 1980 or 1981. They have pneumatic vinyl cushions which roughly oval or D shaped. The cushions are sagging about half flat. This allows the baffle plates to press against my pinnae.
Koss says due to the age of this model, parts aren't available anymore. It looks like unless I just live with the current condition, I have four choices:
1. Find replacement cushions that are a close enough fit, and glue them in place if necessary. The originals have a rolled seam that holds them onto a flange on the baffle plate, so only exact replacements would stay on without glue.
2. Trap a ring of foam or some other springy material behind the cushions to push the saggy cushions outward.
3. Inject air into the original cushions to puff them out and hope I can seal them back up after.
4. Cut the cushions wide open from the back side and stuff them with foam.
In case there's no suitable replacements available, have any of you had success with any of the other methods? They're more or less listed in the order of invasiveness and irreversibility, so that is the order in which I'd try them.
