Have experienced that when you tap in the expander (with the screw in), the threaded part, the nut, has come loose and then just spins when you screw. Poor quality...
 
Could be a tip to have a piece of drywall scrap to practice on so you can see how it should feel when it's crunch time.
 
Stefan Bengtsson Stefan Bengtsson said:
Sounds like a disadvantage that the screw cannot be unscrewed.
It can be unscrewed
 
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Stefan Bengtsson
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Try with blue duomax with a 75mm screw instead - much easier to work with + if it needs to be removed, it's easy to tear down
 
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