Grid Well Inc. - the company that holds the patent for the front loading arbor - has introduced a new safety device. It is called an Arbor Trap. When a lineset is being loaded or off-loaded, the Arbor Trap detects when it is out of balance. If the lineset is out of balance the Arbor Trap prevents it from running away. See the Arbor Trap at www.gridwellinc.com. Rick