Thanks for replies folks. Bill, I'm talking about the aluminum brackets that are used to hold together the frame parts, not the velcro for the prop guard. You can see them as black (mostly) u-shaped bands in these pictures holding the green tubes together: https://www.picclickimg.com/10/!B0h1..._id=880000500F

https://www.planetppg.com/pagepics/G...ICT0089web.jpg

They are obviously flat aluminum bent in a U-shape; question is how are they bent, with what techniques and tools?

Michael