"OK Carl. Don't hesitate to get back when in trouble. PS I guess you don’t know there's a specific Bongo forum where lots of action is going on. Have a look at http://discourse.mcneel.com/c/bongo"

"Thanks Luc, I think I understand all your points. I haven't looked at the updated file yet, but Marika's last one seemed to solve it, which was simplifying the overall chain. Putting a point at the spindle upper and lower, and making those…"

"I’m probably a bit late (was off-line for a time), but anyhow for what it’s worth a few remarks. I noticed in model suspentionbit1001.3dm that the lower triangle (LCA)’s pivot’s Y-axis isn’t in line with the…"

"Looks good Carl!"

"Eureka Marika! Interesting, it was missing 1 more constraint at the end of the chain, and now it seems to work as expected.  Can you look at the change I've made quickly? I see all 'parts' have been made not hinges, joints, or…"

"Something like this:"

"Based on your revision of my file, I changed a couple of things, and it works, sort-of. The problem is the 2 universal pivots, spindle top and bottom, become disconnected. I think maybe because the spindle doesnt rotate correctly as the lower arm is…"

"Sorry I havent been as clear.  I have attached another picture, hopefully it helps.  The 3 white circled areas, are static in position, and only rotate in 1 plane.  The 2 black circled joints, top and bottom of spindle, rotate in…"

"Have to say that I'm having a hard time following what you want to do.. Any chance that you could look up a similar animation online so that we could have a look at that? - Currently there is nothing in the IK -setup that will make the object…"

"If you uncheck the scaling for the universal joint it won't scale.  Looks like I sent you the file which didn't have that unchecked."

"Also it looks like the upper arm was scaling, these will be solid metal parts. With pivots in one direction where I labelled static, and ball joints at the 2 outer locations."

"Thanks, that's very close, but the rear node of the upper arm moves, and it needs to be stationary. When I add another point constraint to it, I lose connection of the 2 main pivots of the 'spindle'.  The spindle will rotate,…"

"Something like this that you want to achieve?"

"Sure, its basic, but I'm just trying to wrap my head around it before bothering with real geometry.  Thanks for the help, Carl"

"Hi Carl, Any chance that you could post the model? It's quite hard to say what goes wrong without having the actual model."