Crown with stem remnants...

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So I purchased the pictured A1 crown, and in my haste, failed to read the fine print where is was mentioned that there’s a bit of stem left behind. Any suggestions on how to remove it, without also killing the gasket, would be most appreciated.

 
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As long as that bit of stem is steel alum should disolve it (thanks Archer). If its stainless, its not going to dissolve.