This goes through some of the things to keep your eyes on with mechanical modeling and then one way you can set up a shock absorber using joints.
BTW, I mentioned some stuff in the video about a script to "zero out" your scales on geo (actually, I guess it would be more "one out", since scale's default is 1). You don't have to worry about that, you can actually freeze transforms on JUST the scale from the menu options or using "cmds.makeIdentity("yourObject", a=True, s=True)".
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