The most visisble changes occuring now are in the back rest. It is a stuggle to find the right mix of comfort, stength, weight and ease of assembly. Revision "S" below is difficult to put together and isn't that comfortable. Revision "T" below it goes a long way to solving both of those problems but still needs a little more strength. Back to the drawing board!
9611-009 RevS
9611-009 Rev T, 1.32Kg