What learned
The packing was found to be only two rings separated by a stainless steel washer in this nylon stuffing box. A plastic washer was inboard the inboard packing ring. I was not able to tease out the plastic washer and, after detaching the compression nut from the main box body, finally detached the rubber tube from the boat stern tube, coaxed the entire box apparatus as far toward the engine as possible, and then coaxed the box complex back toward the original position. That moved the plastic washer forward in the stuffing box enough to get it out. I used a set of picks, a cork screw and a number of other items to tease the first ring of packing out, was able to bring out the stainless washer with the hep of a drywall screw (the washer is small enough to provide some room to manipulate it), and teased out the last ring. All the teasing took time and patience, but once the tools started to penetrate the packing material a little, a point occurred where the packing started to move.Once finished geting the old packing out, putting the new in was absolutely no problem. I used a flashlight and bounced light from a mirror to see inside the stuffing box from time to time. I expect the next time I will replace the old stuffing box with a PSS seal. The process of changing packing on a Hunter 25.5 was a little hard on this old man due to the contortions my body went through to get the job done.