About this 3D model

Not very complex but does the job well. I needed it for some more projects (namely heterogeneous spools, or my spider spool http://www.thingiverse.com/thing:234040 for raw coils) The STL is for a 8 mm threaded rod, and it embeds an optional nut in the background. Still, you can customize it for other diameters, you could tailor it for a chopstick, as it would be a good candidate in place of adding a PVC tube as I did. No need to publish tons of derivatives ;) The customizer on my thumb wheels is useful to set different diameters for the end side (a 75mm one is included) The openscad source code may prove useful to those who want a robust and parametric hook (constants can be changed also for the feeder hook).