Rotating a Component
To snap, right-click the selected ring and choose Snap while Dragging
Assemblies > Moving and Rotating Components
Techniques for Fixing Mate Problems
Drag a component to snap it into place
Assemblies > Mates
Best Practices for Mates
Drag components into the approximate correct location and orientation before adding mates because this gives the mate solver application a better chance of snapping components into the right location...Dragging a component occasionally snaps it into place and fixes mate errors