Zolko
I discovered another tool which you may find useful for Assembly4. It is a utility by mnesarco which you can find here: https://github.com/mnesarco/FreeCAD_Utils.
Download the zip file and unzip in the Mod folder of the development version you are running. It will create a folder and a toolbar in the workbench. It is another way to conveniently add variables and animate them using a slider as shown in the following images.
FreeCAD_Utils-main.zip
Picture1.png
Picture3.png
Picture4.png
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If anyone would like the assembly file please PM me for a Dropbox link. It is too large to attach.