Do what I do. Just tell them to take it out and do it right the next time.

If they give you any lip, just say,

"Well, we seem to be at an impass here. I shall contact the State Board of
Contractors tomorrow, and file papers with them. They have a mediation
service, and I will be happy to do whatever they say."

I only had to say it one time, and the guy changed his attitude in a New
York minute, and redid the job.

Steve