That duck bill tube end is about useless IMO. Darryl with tell ya that it forces your arm back so hard as to be unsustainable for use too. The round end is all you need.
My 570 didn't come with that and I'm glad. I hate to throw anything that comes with equipment away (especially for resale purposes) but I hate storing it just as much.
BTW Jason, try a 570 personally and you won't bother going with the 580.
Originally Posted by Darryl G
I can also tell by looking back to see how they're hanging and often reach back and feel them to see how firm they are.