The past couple times I've bought wine stopped with a synthetic cork, I've had a very difficult time reinserting the cork after opening the bottle. It seems the cork expands after leaving the bottle, and it's made of such a rigid material that sometimes I can't squeeze it back in. (And no, inserting the back end doesn't work, as it sometimes does with real cork.)
Is there a trick to getting an expanded synthetic cork back in a wine bottle?