That thread is ancient, though, and some of the links don't work.
I've been searching and searching... and I'm stuck. This is my 2nd day of searching, so I'm resorting to a new thread.
The phone is unlocked thanks to Motorola's unlocking tool.
I finally found & downloaded the 188.8.131.52 recovery from here:
Following the directions that are pretty uniform across the 'net, I keep getting errors. Is this file/image no longer good? Is there another way to gain root access? I'm not particularly interested in installing ROMs (not opposed to it, it's just not my main goal at this point.) I just want Root access so I can do a few minor tweaks.
Thanks to anyone who can help... this wasn't nearly this difficult the last time I did it!