there should be a loop on your NTH index and thumb.
Pull the loop from the index, through the loop on the thumb
and let the loop on your thumb just slide around the one from the pointer
That should be the tower
Then open up the NTH loop and just bounce it back and forth.
When you’re done, land on the TH side
then toss onto the NTH side and let go of all from your throw hand
and thats the GT