Can these beats be repaired and what do I need to purchase?

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Do they still work ? Electrically speaking... that is.

The head-strap can be 'splinted' with 2part-epoxy and sturdy plastic strip.

Look in the kitchen, thats where I found the perfect piece of material, the side of a freezer container. Yes, its ugly, but the owner wears them to bed! Dont try tape... too messy !

Doubtful, but you might find another set for parts swap.

Dont forget to add them to your Xmas list.