You might try putting it in the freezer for a while. Or as also suggested gently using pliers. Hope this helps......How do you guys deal with a stuck bottom piece
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Addendum: I was wondering -- what about loosening the 510 screw? Might that "release" tension on the innards and allow you to remove the base piece? Mine is in use now so can't try it but wanted to mention.... hope it's not too far off base.......
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