Fished out the aforementioned sling today. Seem to have mislaid instructions though so yet to see if it's.a hit or not.
Also discovered today that with.a few engineered adjustments, I will be able to drive my van from my electric chair hence completely revolutionising my whole life. Am awaiting next step with baited breath. Things seem to be coming together so well at the moment. Not sure whether to be sceptical or to just lap it up.