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tbobAnd if that doesn't work, tell him you have a couple of friends you'd like him to meet, Johnny Little Banannas and Big Nose Vito. 
Seriously, you are in good shape with your contract but you need to understand if he decides to prolong things, it could be a while before you get your money because even after filing suit and obtaining a judgment, you'll have to enforce it by attachment or execution, a pain in the ass.