i'd still do what others have said. Offer a full refund upon return of the product in the condition it was sent out in. Buyer pays return shipping. If you haven't already put that in your listing : returns accepted , buyers pays return shipping.
He will most likely decide his best recourse is to keep it. You did your part without being taken advantage of. If you do this and he leaves negative feedback (and you offered to return the product via eBay messaging) his feedback will be removed.
disclaimer - I'm an eBay employee but I'm giving you my thoughts based on my opinion and personal experience alone.
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Jack Taylor Super Tourer Tandem (FOR SALE),
Jack Taylor Tour of Britain, Px-10, Carlton Flyer,
Fuji The Finest,
Salsa Fargo, Santa Cruz Tallboy, Carver All-Road
.