Your asking price was $600, he gave you $575. He assumed that you were sending everything pictured by the phone conversation ya'll had talking about the line sizes and stuff.
Now was $575 too much of a good deal that you have to remove the lines? Wether the items were worth 1300 or not your asking price was $600 your price not his.
C'mon dude cough up the lines and make it right.
You told him in another phone conversation that you were going to send the remaining items anyway, don't be an indian giver. (no offense)
JMO> Cp