The lock does not work (or is too inconsistent) on the following characters:
Too low to ground after footstool - Lucario, Link, Sheik, Toon Link, Olimar, Robin, Charizard
Too wide to hit sour spot - ROB, Bowser Jr
Too hard to footstool - Ness, Villager, Mr Game & Watch, Pikachu
To side of opponent - Jigglypuff, Kirby
The soft N-air will do 5% from the front and 4% from the back on characters with thin hurtboxes (e.g Peach, Zelda, Falcon).
It will do 6% from the front and 5% from the back on characters with even slightly wider hurtboxes (e.g Ike, Palutena, Mario).
To sweet-spot the turnip, it must hit the opponent quickly after being thrown (you can't throw it too early).
If you are using the second variant of the combo shown in the video (where the opponent doesn't stand up), you have to immediately throw the turnip after each N-air to get the sweet-spot (11%).
However, remember that the N-air will not lock characters after about 70%. This means that it's going to be okay to miss the sweet-spot most of the time. You might even want to hit the sour spot to keep them in the lock a little longer.
The most damage efficient way to end the combo is with a turnip insta-throw > U-smash combo (or frying pan).
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