Product review (4 stars): This worked great. I was surprised it could make the 90 ...
This worked great.  I was surprised it could make the 90 degree turn in my drier vent line, but it did with no hassle.  The instructions are quite explicit about not rotating the rod counterclockwise.  Of course, that's the first thing that happened (inadvertently naturally), but I then had a devil of a time reconnecting the rods back in the drier vent line.