Advice on re-sealing a Grande.

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Anyone know the best way to re-seal a Grande? I have put the plunger back in and the cap back on. I was just wondering if I should put Krazy Glue around the edges of the plunger or somethin. When its been turned on a while the heat makes the plunger push itself out a bit but not totally. Thanks

[mark]

Ok thanks for info.

[mark]

O ok that makes sense. Thanks for the advice.