Might be a workable concept, but not sure what the picture is. Looks like a plastic protective cap with felt, offset to the left. Lead wires appear to go over the cap, so maybe it doesn't come off. Maybe the wires to retain the plastic cap, and real connections below the cap,

Pretty badly presented item - not so uncommon on eBay. Perhaps useful to contact the seller and ask for more pictures. Someone good with tech is not always good at communication and sales......