Here I will show you how easy it is to modify spherical joint (automatically converted from a point-point mate constraint) properties so that it behaves like a revolution joint (which requires at least two assembly constraints or one insert constraint).
![lock-dof](http://vdssolutions.files.wordpress.com/2010/02/lock-dof.png?w=320&h=442)
Step 2 - Is to lock the position of two of the three rotational degrees of freedom. (This will create a spherical joint with one rotational dof about the desired joint axis)
Tip: Multiple spherical joints can be selected at once so that they can be modified together – saving time
Note: A green symbol will appear in front of the spherical joint indicating the joint has locked dof.
Source: vrblog.info.
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