Try A&H Enterprises in Tustin, CA, 714-258-2525. They supply rebuild kits for pressurized alcohol stoves and were quite helpful. At the end of the day, however, and after breaking the tubing that went from my tank to the burner I gave up and bought an Origo.
There''s a huge difference in heat output compared to my old, clogged Princess pressurized stove. The Origo boils a quart of water in about 8 minutes vs. 6 minutes on my home electric stove. And, its safe, unless you try to refill it without removing the canister from the stove there''s really nothing that can cause a fire or explosion. Yes, alcohol has only half the heat output per pound of fuel as LPG, but that doesn''t consider the weight and size of the tank! Adjust for that and alcohol is actually about as efficient weight wise, and probably occupies less space per unit of heat than LPG. Unless you''re living aboard and going through tens of gallons of alcohol a year, fuel cost is a non-issue. Alcohol stoves have gotten a bad rap due to the old pressurized stoves. There''s literally no reason to spend thousands of dollars to refit with LPG. (I have no connection with Origo or the industry).