Thanks you guys!
I finally had the time to look through my tools (the slow drip was not forc
ing me to do anything quickly) and I found a deep socket that fit the bill
(I mean, the nut) - 15/16". Better yet, the handle of the socket wrench wa
s very long (actually an old-style torque wrench). Now, I understand the p
hysics of torque = force x moment-arm, but I was still surprised at how e
asily the thing turned once I had the proper tools. So easily that I think
I had to have loosened it with the crescent wrench. I mean, when I was us
ing the crescent wrench, I seemed to be physically deforming the nut, with
Anyway, I was able to get the replacement cartridge at home despot (under $
8) and the drip is no more. Yay!