I found a website that could supply me with the spare foam gaskets I needed to repair my speakers. After some research I found that Memorex use Tandy parts and found a dutch site that posted them to me the next day.
As you can see they are in pretty bad shape. This happened due to the foam becoming old and brittle. Not some crazy one-off party.
The repair was all going to plan until I glued the outer part of the gasket in place. After it had cured one of the speakers voice coil was chaffing on the sheath and making some nasty noises. I had to painstakingly cut the newly glued down gasket away from the metal surround to free up the voice coil, carefully cut out the centre paper cone and shim it out before re-gluing. If all goes to plan, once the glue has set I can take out the shims and carefully stick the centre cone back in.
There was a small amount of cosmetic damage on the speaker that went smoothly between 12 and 3 o'clock. As seen in the picture in the bottom right. This was from removing the 'tit-tape' that was holding the foam together before I attempted the rebuild.
Fingers crossed the Speaker curing at the moment will be fine.
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