vieucaillou - Drawhelix13 is the version I used. Now I can't reproduce the dimensional inaccuracy I mentioned earlier. I started these models in SketchUp7 but I had a lot of trouble with that version so I uninstalled it and went back to SketchUp6. Maybe something was happening there. But I just opened Sketchup and asked drawhelix13 to make me a helix with a pitch of 180" and I get a helix at 180" Confusing to a novice.

Thanks for the input Remus. An update - I uninstalled SU7 and that solved some of the weird problems I was having between SU and Hypershot (images opening in HyperShot that looked like something from a bad move about LSD). So I'm back to work but I still have the strange file saving issue. I've attached a screenshot of the folder hierarchy but I've never done that before so I don't know if it will show up correctly on the forum. This shot is after working with a drawing called SpiralSU6Classic. All of the numbered files 0 through 9 are the automatic saves during my most recent period of working on the drawing. And two other things to notice - there's 2 files called SpiralSU6Classic and there are no backup files. Doubt I'll ever solve this one but thought I'd send off an update anyways. Thanks again [image: ObHx_BizarreSaves4.jpg]

Ive emailed you.