Hello My name is Bogdan, and I am from Romania. I just started on a slingshot that is made from plum tree wood. I want to equip it with bands from an old gas mask. I have owned gas mask rubber slingshots in the past( when I was 12 years old), and they are very powerfull. Has anybody owned a slingshot like that, and can you tell me if you measured the speed of the ball?