Robert,
I understand that like myself, you suffer with back problems.
It is an old wand and I think reduction of back strain was a big factor in the design of those . You may notice in the video that I have the handle set right high up (above the bend). This allows me to stand almost bolt upright with a straight back. Wanding almost entirely an arm movement rather than me bending my back
the irony here is that my back was made worse by using a Dry Fusion machine. It's not their fault but the most comfortable position did not tally with the incremental adjustment on the handle. I was cleaning one day near a full length mirror and realised I was stooping over the DF machine.
Since I set the CFR wand up this way, I have had virtually no back pain from wanding.