- 3,875
- 2,494
- 113
- Location
- Hiawassee, Georgia
When taking the plug out of aluminum, I have used a heat gun to warm the housing, which does no harm. The coefficient of thermal expansion for aluminum is high, much higher than for steel, so the hole will expand. While the housing is warm, place a small amount of dry ice in the plug. This will contract the plug and it will then come out quite easily.