I'm trying to build a aprt based on a spur gear that I build from the Toolbox.  I don't need some of the features, so I tried deleting them and that caused errors in equations.  I went into the equasions editor to remoive the lines no longer needed and the toolbox part is build with several lines defining the same parameter.  When I exit the equations editor I get this error:

If you can't read it says "The following sets of equtions define the same paramets: ... Only the last equation in each set will be applied." [EDIT: I attached the screen shot since the embed was so awful.]

Once I hit OK and go back into the equations editor, only the last line is there and it shows a cuircular reference error.  The smae thing happens if I go inot the equations without making any part chages adn try to exit without making cequations changes.

How can I fix this?