Haligan;
When you use the screws do you turn the device upside down?
Upside down, sideways, shake it, etc.!
Some Brands are easier than others - and one even has springs with the Screw Terminals, which keeps them up kind of stoutly.
Some Brands have very tight loop points, others have easier to manage areas for looping the Conductor around the Screws.
Can't recall which Manufacturers have what, so it's pretty much a Crap Shoot!
Scott35
