After several in's and out's of the nut I have gotten pretty good at loosening and tightening the strings
Between the hubby and I (mostly him) we have the nut so it sits nicely by sanding the bottom after we adjusted the string slots to proper depth.
The credit card will stop at the 3rd fret wire. It's not a perfect stop on all the strings due to me not paying attention when I first sanded the nut which caused problems for the "G" string that would become too low if we took more off the nut.
I am not going to glue the nut just yet. I may decide that I want to start over with a new nut. If I glue now I won't have that option so easily available.