I never knew anybody made that tool. but that is the way we have done it for years except all we do is take an old valve epoxy a grinding stone to it. Making sure the stone is a little larger diameter mark a spot on the valve for a stop point (hose clamps work good if you don't put so much muscle behind them that the slide) an old head is a must because it is hard on the guides though. as far as trying to cut some with a drememl good luck i wouldn't do it. just make sure that you use a bit designed for aluminum.
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A good plan, violently executed now, is better than a perfect plan next week.
George S. Patton, General (1885-1945)
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