BTW - Shipping includes Handling. That is the purchase of packing, the time to arrange or deliver the goods to Post, time and petrol, busfare etc.
S&H is more than just Postal cost IMO. So if this guy had a go at the shipping cost of 20 vs 30, I would have just stated that is the Handling cost of your time and materials.
And a learning point, always declare all faults with any horn for sale, and try to photograph the item correctly.
Thanks for the heads up on the guy.