You can use a longer piece of keystock (you can buy it by the foot) and get out past the wallowed out area of the keyway. I did this on mine. As you can see from the pics, it was pretty bad. There wasn't a lot of good keyway on the engine side, but I haven't had any problems. I ground the keystock to fit the contoured slope of the crank on the engine side I loctited it in and tightned the set screw as tight as I could. Should work for you too. Good luck
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