I had a client who was very slow in paying. He ended up filing bankruptcy later but just as this started getting out, I had just about finished a project. All of the other inspections had been finalized. All I needed was the building final and then we would get CO. To this date I still have called. He mentions it every now and then but I stand fast.
We are going to court shortly so I am going to hold that over his head. However, keep in mind once you have called for CO there is no leverage left. I did finish up a couple of otehr houses and had the CO. It just needed carpet and some punch list items. He hired someone else to finish that part and got it rented out.