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Have you tried shrinking the aluminum and the pin away from each other with a CO2 extinguisher. Drill a hole in 1/2" plywood just large enough to not show daylight at the bell housing edges when dropped over the pin. Put the horn of the extinguisher down on the plywood and carefully discharge the CO2 to the metal parts. The pin should shrink away from the aluminum, and vice versa. Have used this method to shrink out crank bearings on motor cycles, and alternator housing front bearings for many years. Be careful, CO2 will freeze your skin instantly, and cause worst than frostbite.
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