The Modified Darby Escape Tube (M-DET) really is a game changer for opening both types of handcuff (male and female).
The modification allows for you to apply the additional force required to fully engage the threaded lock part.
Simply insert the Diamond Wire Blade (DWB) through the holes you made in Step 1. You can then turn the DET like a corkscrew to engage the lick part.
Once engaged you then pull the hard on the DET to open the handcuffs without a key.
For more tips like this I recommend my handbook – ‘How to open handcuffs with a key’.