You're doing things right. Just stay polite at all times with your communications, and make sure it is explicit that the buyer is welcome to return the lens for a full refund if he is not happy with its condition. Ask him to provide tracking details when it has been shipped. If he wants to be difficult and open a case, all you should need to do is to clarify that you have no problem at all accepting a return of the item for a refund, and that you have invited the buyer to do precisely that. eBay will instruct the buyer to return for a refund. If the buyer digs his heels in or has the item worked on (ostensibly) without their prior approval of a partial refund to cover "repairs" eBay should reject their claim.The guy got back to me saying he will bill me for the cleaning of the lens as it has to go to the camera shop.
I replied reiterating that he may send it back for a full refund, but I will not be offering him a partial refund.
Cheers,
Brett
Edit:
More here
http://pages.ebay.com/help/sell/item-not-as-described.html
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