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Brrigs uses the same aluminum key in all engines, regardless of points or magentron. The problem is the nut or ratchet starter (whichever is used), has to be tighten to the required torque. In this case, tighter is better. The key doesn't hold the flywheel in line with the crank. It only provides a reference to line up the timing. I've run a few engines with no key in there at all. Just line up the 2 key grooves, and torque the nut down. What actually holds the flywheel and crank together is the taper, and the pressure of the torqued nut. I've never seen a briggs engine points, or magentron that used anything but the aluminum key. I've done many conversions, re-using the key as well. The key stock from the hardware store should NEVER be used. Its steel. The proper key is aluminum, designed to shear if excessive forces affect the crankshaft. If you use a steel one, you end up with a broken flywheel, crankshaft, or major internal engine damage, or a combination of all three.
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