Morse Stuffing Box

I have the Morse type stuffing box.



I've pretty much run out of threads and cannot tighten it anymore and I'm getting a stream instead of a drip. Can you repack this type of box or do you have to pull the shaft and replace the whole box. I backed off the nut but all I could see was what looked like a nylon washer. I assume the packing material is behind that??? What's the best way to get the packing out and what size do you use? I went ahead and bought the 3/16" Gore-Tex shaft packing that is recommended for a 1 1/8" shaft but I'm not sure if this is the right size for this type of box. I'm only familiar with the packing-in-the-nut type boxes. Any help with this type box would be greatly appreciated.