I have an extra 1 7/8" service wrench that is the size of the jam nut for the packing bolt on the stuffing box. It's a short handle so it will make it a lot easier to get in there and tighten the nut.

The wrench is actually one that was used by NASA in the space shuttle program. How cool is that?

You'll get one of these:

$30 shipped to anywhere in the USA.