> You're not very clear about how the bottles broke. Did they break during
> or after corking? Are the necks breaking or are the bottles just
shattering?

The top of the neck broke off while the cork was being inserted.


> Are you using #8 or #9 corks? (#9's are wider.) Are your corks low or
> high quality - are they cork all the way through or are you using the ones
> with the plastic cores?

High quality #9 corks, 1.75 inches long.


> Personally, if the answer isn't apparent after you've asked yourself all
> these questions, and you got the bottles all from the same source, I would
> ditch the bottles.

These were bottles from wine I'd purchased; after drinking the wine, they
ended up in the recycle pile in my wine cellar.

Paul