There are no screws or other points for tool access.

There is a seam around the rubber earpiece, so let's start poking there.

The rubber comes away easily. Some weak adhesive appears to be used to keep it in place, but it requires only a gentle pull using only fingers to peel it away.

Unfortunately this peels not just the rubber, but the entire earpiece including driver. Not, however, including the wires.

On the plus side, it no longer rattles.