There are many ways to do a Gyroscopic Flop, this is the original version of the trick and also a two repetition variation.
Start with a Trapeze, then, with the throw hand, wrap the string around the axle on the side closest to your body. You now have a wrap around the bearing.
Now pull both hands apart and watch the yoyo start to flop. After the yoyo has flopped, undo the wrap on the axle by swinging your non throw hand around the axle. Because of the flip, the yoyos spin has now changed directions.
Land the yoyo on a trapeze and you can bind from there, it’s already on a proper back spin.
If you were continue to flop the yoyo over twice, instead of once, like we just did, you would undo the axle wrap with your throw hand, just like you go in. You would also bind the yoyo like you normally would, as two flops mean the yoyo is spinning in its proper direction.
Tricks to know before Gyroscopic Flop: