[Ianworld]

The octagon method works great but my team's part was a cnc'd metal chunk that weighed close to a pound. Not that efficient mind you. Thankfully you can attach to that big ring in many different ways. Just about anything you can stick through it and screw on should work great. Last year we used it as a pulley and we literally just put a flange thing on the end and wrapped string around the big plastic output ring. It worked perfectly for our application. Things don't always work out so nicely though.