You just never can tell what topics are going to generate long threads.  I wouldn’t have bet on this one.

This discussion has motivated me to try to improve my manual motor lift system, which I’ve spent most of today doing.  I think I’ve taken it about as far as I can, without getting too crazy, and I think I have a way to estimate pull force without buying special equipment.  Hopefully, I’ll have an update tomorrow.

In the meantime, if anyone has pictures of a GBI manual lift system, I’d really like to see them.  If it was a pure vertical lift, I’m thinking that the rails must have been longer (extending higher).  Also, I’m guessing that there was no motor-tilt feature.  

—Peter