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You can edit the source circle of the array, add a parameter and adjust it while editing the source, save the array edit and the changes are kept.
If you use the Ribbon, pick on the array, pick the Edit Source button, proceed from there.
I am in 2014, hopefully it works the same in your release.
GrantsPirate
Piping and Mech. Designer
Always save a copy of the drawing before trying anything suggested here.
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If something I wrote can be interpreted two ways, and one of the ways makes you sad or angry, I meant the other one.