What do you do if a patient refuses the ultrasonic?

I have a patient that won't let me use an ultrasonic scaler. He has had a cavitron used on him before and said it "gives him the willies". He has poor home care and 4-5 mm pocketing generalized. He had a deep cleaning 10+ years ago and has been on a 3 month recall. He has a lot of crowns and bridges and had a 6mm pocket yesterday. I've seen him 3 times now and did what I could with my hand instruments. He has that awful in-between build up. Not soft plaque that can be polished off and not fully calcified calculus that pops off. It is tedious to clean. I told him yesterday that he needed another deep cleaning and that I would have to use the ultrasonic. He said he's not sure he will do it. His wife ended up scheduling him so I can at least get the SRP done with the ultrasonic. But I'm anticipating him refusing again once he's on perio maintenance. What do you do with patients like this?