For me, that was trying to affix a phone to my scooter handlebars. They are not handlebars as such because straight after the grips, they disappear and become part of a dashboard moulding so the usual clamp has nowhere to fix. A trivial thing, but I wanted to read the sat nav on my phone whilst I'm driving.
Today, a Ninja Delivery driver turned up at the house and my problem was solved. He had simply stretched a couple of old bike innertubes between his mirrors and to that, had affixed his phone, plus assorted clips to hold his paperwork.
Ingenious and an almost perfect and costless solution!
@nathen007