oops rereading your post I don't think I answered you question. I will leave this up and think about the script changes which I presume requires changing instance variables. Yes this is possible via a variety of routes. I think you can just do it by having them all access the same slider value. (just pick one for instance slider('piston2091') and copy that to the others). Otherwise to do it by scripting you just put a variable @@value for instance or ...and this is not recommended $value in the controller field and then change that the value of @@value (or $value) with script. The program can be a bit sketchy sometimes so for original troubleshooting I generally just risk the wrath of ThomThom and go with the global variable $value.

Thank you so much! That's exactly what I needed!

Yes, the brain is very colorful, but as soon as it is exposed to air, it reverts to a uniform grey color. Or, maybe that's the "color by layer" effect at work? I truly didn't think about that when I uploaded the model. I guess a colorful brain is kind of strange.

Is this SketchUp use or abuse? Just kidding.