Try adding the rotation animation first, before keyframing the "drop". Order is important when combining rotation animations and keyframe animations. I personally havn't done this in some time so i may have the order backwards but easy enough to try.
Yes indeed, David is correct
You firstly have to "Add Rotation Animation" before "Add Keyframe" to move your object. It's the better way.
But there is a trick too avoid this problem: "Create a New Group" which contains the object that you want to rotate (even if it's just one Bolt, it doesn't matter) and then, "Add Rotation Animation" this Group. It works! Software will simply understand it's another Part/Group, even if it the same Bolt!
Thank you both for your answers! Great help! I have bolts spinning in the right direction now! superb!