Take a very large flat head screwdriver and a dremel tool...grind/cut it to shape to make it look like the tip of a valve tool.
You can also use an appropriate sized sheet of steel...and cut out the notch you need to make a sort of key. You may need to heat treat/temper it so it won't bend.
Or...you can use a lathe and turn a cylinder to fit the valve...then use a mill (or even a good file) to cut the prongs you need to fit. Again, you may have to heat treat it...depending on the metal you use.
Or...you can buy/borrow a valve key.
Last edited by m102404; January 30th, 2012 at 08:41..
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