The attached zip has the SW14 model with 2 configurations and 2 explodes and 2 motion studies.
The "plunger 2009.avi" is a traditional assembly instruction video - hidden parts appear and move into position. I made a small effort to spin the screws into the nuts but that detail is lost in the render.
"plunger 2014.avi" is a practice session at starting with a kit of parts on a table and watching them fly into position. I couldn't attach a good looking render of this animation - file size too big - sorry about that. The new rotate in the assembly step is progress in functionality, IMHO.
To make these videos I created the explode steps first. I tried to create the steps in the proper order for realistic explode collapse and verified my progress by animating the explode/collapse (without using motion study, to be clear).
I was able to change the direction of rotation by using a "-" in front of the angle of rotation (e.g. -1800 to turn 5 rev's ccws). The animation preview seemed right.
When I attempted to use motion study wizard to create a motion study of the explode, I didn't get the same rotation as with the animation preview. I didn't find a way inside of motion study to change the direction of rotation of the component's explode path.
I also have one nut that jumps into position without spinning durning playback. It seems okay when I step thru with the time line.
What tricks am I missing for spinning my bolts? In the old days (really old days) - Animator made this easy. Sadly, that functionality disappeard circa 2000. Prior to SW14, I would put a motor on a bolt to spin it while changing a distance mate.