On a lark I bought a cheap tubing turner today. The design is pretty nifty, just push a hook through the fabric and pull. But after a quick test run I am not entirly convinced. The hook is rather flimsy and kept opening up and getting caught in the fabric instead. I had to use a lot of control and some gentle guiding with the fingers to stop the hook from opening. After about three tries it did get easier, maybe it's mostly a handling issue, but I had expected the tool to make it much easier.
My usual method is to close one end of the tubing and then gently push that end with a blunt object, normally a chopstick. My least favorite method is the needle and thread, because unless the needle is really blunt, it keeps piercing the fabric, plus I find it hard grasping the needle when it's inside the fabric.
Which is your favorite way of turning a tubing?