I fixed the one on my JD 420, by taking a small o-ring, cutting it, wrapping around cutoff valve shaft, and compressing it with the nut, worked great. Mine was dripping quite a bit
 
If there is still original packing in there, but just not enough to stop the leak, just add some thread or string to it. Make a few wraps, tighten the nut. Keep adding until you get the desired resistance.
 
In the hobby of live steam a common practice was to make our own packing material from teflon tape.

Take the tape and twist it to get a string. If it is too boring twisting the tape by finger a drill can be used. Keep slight tension on the tape as it is being wound, dont over wind.

3 strings wound together makes packing yarn.
 
Jaden you have it. That is the old school stuff. Still find it in some valves I work on. Another way to fix it is with Teflon rope. That is also at the plumbing store. Teflon rope is used on anything from gas all of the way up to steam valves. A very sable material. Comes in several sizes. I just use the small diameter and wrap it around once or twice as needed.
 
I use some of the old water pump packing made for something like that. IT'S like a rope with graphite on it. Just rap it around the shaft and put the nut on and tighten till it don't leak. Trouble is I don't know if you can still buy the stuff now days. So much of the good stuff becomes obsolete. Now they use o rings or some manufactured seals that are harder and more expensive to replace. I still have some from years ago and just used some lately.
 

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