What tool do you use in order to align the blades in a 16x20 four blades Saunders Easel? The manual says that there are two hex screws on each actuator that permit squaring the blades. This is true. My problem is that I do not have the appropriate tool, and it is not a good idea to carry the easel to the tool store! I think it could be some kind of Allen Hex Key. Can you help me? Thanks, Henry.