About this 3D model

This is a derrivitave of http://www.thingiverse.com/thing:7484but the cheapest on ebay uk i could find was 90mm (£7 for 2 inc shipping from HK) so i made the ring bigger.I also removed the nasty 90 degree overhang in the clip, and reduced it to a nice 40degree slope.Sorry but licence is same as the original