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Larger surface area in the aluminum, a sort of "sprung" behaviour to the insert that makes it stay put and a steel surface for the steel threads of the pedal. You're not likely to need to worry about the aluminum threads pulling out.
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Weldangrind
"I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
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