In response to an email from Doug S. I would like to clarify some of my "stripped nut" issues:
The nut is rounded out so I can't turn it to loosen or tighten. The threads are still good.
It is the nut that the handle attaches to for the hot water.
I wanted to take this nut off in order to replace a washer that would possibly stop a small leak.
Doug- does this help you out?