Perhaps it just won't do really tall 750 ml bottles. Most of us use 375ml ice wine bottles. After all it says it does 1.5 litre bottles, and they are usually pretty tall.
I wish it said something like will handle all bottles between 5" and 16" (or whatever).
the procrastinating wine maker in the Niagara Region of Ontario Canada
"Visual signs of fermentation are highly overrated"