Not well IMHO, see below.
Would be very rare to actually find a lead foil topping on a wine bottle anymore (save for a VERY old one). When it was discovered that lead based paints were damned harmful of consumed/absorbed. Actually it was American Inner-city neighborhood where this came to light. Lots of very young kids were getting toxic poisoning from chewing on window sills ... odd, but a true bit of history.
A zillion years ago I did, in fact, strip the lead foil off wine bottles and actually use it for just the purpose you mentioned in your thread opener. That said, the wine industry shifted to aluminum caps close to 30-40 years ago. No weight in those Puppies. Far cheaper, and zero health hazard (at least that I know of).
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