I received a bad part. What should I do?

$60 back and he keeps the box sounds fair to me. Its the shipping that would be hard to reimburst. No matter what you do someone would have to eat the shipping. So letting Mark keep the box would release him of the shipping to return it. That does sound fair. Hope you all can resolve this. Sounds like Mark has a valid complaint . But I would have to lean toward Mikes answer to resolving this issue. A full refund would require a return of the item which would be the responsibility of the buyer to ship it back. So by the seller letting Mark keep the box its Saving him the difference. Steve