I had that problem with a few buyers that after winning ,they change there mind.
You have two options.
1. If he does not pay and not contact you,you can open a case for non payed item,and after 5 days that the case is open,you closed the case,the system will ask you if the buyer paid,you will click on the "did not paid option" and ebay will not charge you any fees involved with this transaction and even more.It will stay on the buyers record that he did not pay.
2.If he did not pay but contact you to give you a good reason.You can send him a cancellation agreement.After he accepts the agreement.ebay will not charge you any fees involved with this transaction.The buyers record stay intact in this case.
When i used option #1, there is a 50% chance the buyer will pay within the 5 days time period.
You can closed the case no early than 5 days and no later than 30 days.
If you close it too early or too late,ebay will charge you the selling fee!
As far the free hanomag,you will have to contact ebay for clearing your feedback.
That should not be hard because you stated that the hanomag is not included.
That happen because some people are stupid and the pull the trigger before even reading the description.
Don't give up on selling on ebay.It is a good tool to get possible buyers for your other stuff.
