This is a classic 5A trick by yours truly.
Begins with a reverse Split Bottom Mount. The yoyo is going to mount on the outside string this time around. Bring your non throw hand down. Flip the yoyo up and over to the same string in an under mount. All the while your are doing pinwheels with the counterweight.
The yoyo comes down with your arm and you are going to unravel the yoyo with your non throw hand almost as quickly as you mounted it. Then, all you have to do is the pin wheels.
This trick may not look like much, however, you are going to build some good muscle strength learning this one. Mounting the yoyo while simultaneously swinging at counter weight is no laughing matter. Much precision and rhythm goes into a trick like Double Pinwheel.
Tricks to know before Double Pinwheel: