[SilverStreak] stuck propane shut off valve

[joepatwink@xxxxxxxxxxxx]

In our 1969 Sabre there is a lever type shut off valve for the whole stove. 
There is also a tiny valve for the burner pilot light that you increase and 
decrease the flame or shut off completely with a screwdriver. I think the 
pilot light valve leaks because when camping this week we thought we could 
smell gas when we came back to the trailer. To test that theory I want to 
shut off the gas to the stove, but I can't turn the lever on the big valve. 
It has not been turned since the stove was installed I bet back in '69 and 
its froze tight. What would be the best method from here? Gentle tapping 
with a hammer? Take the valve off and soak it in something? Take it off and 
replace it? Your advice will be greatly appreciated.
 Joe