Are you unscrewing the lock all the way, or only till it gets loose??
You need to turn the screw as far as you can without forcing it.
The last bit of travel of the screw lifts the latching cam out of the slot.
__________________
Mike Starkey
VAF 909
Rv-10, N210LM.
Flying as of 12/4/2010
Phase 1 done, 2/4/2011 
Sold after 240+ wonderful hours of flight.
"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."
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