I ran across a DIY website that had a remedy for a leaking stove burner valve. Rather than taking the valve apart this service tech recommended using 3 in 1 oil rather than valve salve. In fact, he strongly discouraged disassembling valves.
Here is what he recommended:
1. Use a 3/8" rubber tube and insert it over the orifice nipple shown on the right of the above photo.
2. close the gas line shut off to the stove.
3. put several drops of light weight oil down the rubber tube.
4. While gently pushing and pulling of the burner knob to unseat the valve, blow (with your breath) through the tube to inject the oil into the valve.
5. Making sure no flames are lit, turn on the gas briefly to expel any excess oil from the line.
I had one valve that had a very minor leak detectable with one of those electronic sniffers. After this procedure....... no more leak.
This was sure easier than taking the stove apart to be able to take the valves apart.
I'll keep you posted whether this fix lasts a week, a month, or a year or more. So far, so good.