> One takes thin some piano wire, guitar string, or other high-strength
wire,
> and attaches it to two handles.
>
> The wire is then slowly pulled between two supers to break any propolis
> bonds created by the bees.  This eliminates the prying required to break
> supers apart, and thereby reduces wear and tear on the corners of supers.
>
> I would not pull too fast, or one might kill bees on top bars with the
wire.

This is precisely why I never cared for the piano wire method, bee carnage!
I prefer to
use two hive tools, one to pry the top body up just enough to fit the other
tool in to pry
the bottom frame (one frame at a time) from the top frame.  A bit of work,
but no sliced bees.

Aaron Morris