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While my soldering skills of the drain adapter were spot on, apparently my measuring skills were not.  After fitting the drain, a small piece of PVC, and the threaded adapter to the top of the pipe, the shower drain was way to high.  So I had to unsolder the brass adapter, cut off the copper trap, and replace it with a PVC one.   The upside of this is that I get a nice fresh clean trap to work with, the downside is that there are now many more potential spots for leaks.