Hi Wypipo, just watched your video...
You need to hold the carb up the other way, so that the floats are hanging/swinging on the pivot pin. As the rotate the carb you'll see the tang slowly move towards the spring loaded pin on the float valve.
If you need to adjust the float height then yes, remove the floats from the carb and gently bend the tang, it won't need much.
Cheers, Dave.
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