Forgive my dumbness but what is this strap on the SP140 for? Is doesn’t seem to be connected on either end to anything that I can find.
Its just a strap that you can connect to the frame to help keep the shoulder straps on the harness from rising to far up. It just pulls them down.
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Thanks. Is it safe to ignore it if the straps are comfortable without it?
You don’t have to use them, they are just there for comfort.
Thanks for asking. I was wondering the same thing myself.
I was puzzled by the same thing, and also noticed that the motor tipped back when walking with it placing the bulk of the weight on the thinner part of the shoulder strap. When I compared with my parajet, I saw where they attached on the frame, so I did the same. Now my motor rides comfortably on my shoulders when walking 
Can you send a photo of how you connected the straps? Thanks.
I removed them entirely from the harness. No issues.
I vote for a picture too.
A picture is worth a thousand words 