Not an expert, but if it's got a nut on it, it's probably not welded in.

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A.S.E Tech A1,A6,A7,A8 & MVAC 609 + EPA 608

Unless stated otherwise, any question I ask is about my greymarket 1985 380SEL.

One would think, but I've seen nuts welded onto housings before.

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Tony
(Actually, a member since 2000)