Hi guys I sold a tank recently and despite my best efforts the courier seems to have used it as a football and it's been damaged in transit. An idler arm has broken and it needs some bits sticking back on. I've offered to pay return postage be make repairs to bring it to as sold condition (at my expense) l. Does this sound fair? Or should I (as the buyer insists) refund him because he's decided he doesn't want it no matter what?