Thanks, Scott - that's a lot of help.
I still can't get mine to work, but I'm pretty sure I know why:
* I've got my slotted-bar part included in the assembly - and the curve (no longer an axis) is defined in the part
* But I'm referencing the bars from the tetrix parts in my working directory in my assembly.
* So when I create a point datum for the slot constraint, I'm trying to define it on the included part - from within the assembly.
... which sounds like the wrong thing to do.
So, (maybe tomorrow) I'll try copying and modifying a local copy of the Tertix part and defining the datum point for the slot in there.
I see the Replace option in the model tree - hopefully that will keep me from having to rebuild the scissors. But I'm getting pretty fast at it by now!
Thanks again,
Dan
