At first glance this may resemble a tangler, or at least in that family of tricks, but that couldn’t be further from the truth. Turnstiles are the true definition of a counter-weight yoyo trick.
Start with a fake double or nothing. This differs from a 5A double or nothing. You throw the counterweight around the thumb (or index) like a windmill, allow the string to wrap around the whole non throw hand. Catch the counter weight in the throw hand and land the yoyo on the non throw hand index finger.
You need the string around the back of your hand, near the wrist.
Dismount the yoyo and the counterweight at the same time by bringing your throw hand around and just dumping the yoyo off the string and dropping the counterweight.
Now you need to turn your non throw hand wrist, palm up. With your throw hand, you need to be moving it in small forward circles. The idea here is that you need to get ahead of the counterweight as it tries to unwrap itself.
Turn your non throw hand back inward so as to mimic the beginning mount. Repeat.