s.a.r. rescue baskets

[coffindodger]

RESCUE BASKETS.

The mark 499 Rescue Basket
This is used widely with the Search Rescue World.
My question is
On one end in the centre of the main frame of the basket itself,
there is a small screw, and this screws into the metal frame.
Has any one any sensible and real ideas why this screw is located in this position,
and why?????.

Thanks.