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I would cut a circular hole of the correct diameter in a piece of fireproof sheet and wedge it in place so that only the steel sleeve is exposed. An assistant can spray the case behind the fireproof sheet with water to avoid any unwanted heating.
(An air-only torch will burn at around 1,995 °C (3,623 °F), Magnesium is flammable, burning at a temperature of approximately 2500 K (2200 °C, 4000 °F), and the auto-ignition temperature of magnesium is approximately 744 K (473 °C, 883 °F) in air.)
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1972 911T Coupe with a '73E MFI engine and 'S' pistons
10 year resto mostly completed, in original Albert Blue.
***If only I didn't know now what I didn't know then***
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