Circle diameter constraint during (S) seperation of other circles(see picture)

Preface: I am making a detailed flower http://www.daylilies.org/ahs_dictionary/pistil.html. I am at the pistil and am extruding the style, and here is where I have run in to a minor issue.

Issue: I extrude a circle (style) with other circles, so that only their length changes. While trying to (S) make them further away from one another their diameter also changes. I do not want to change the diameter so that there is uniformity along its length until I reach the stamen.

Solution?: Is there a way to constrain the diameter of the circle while resizing the distance of my extruded circles?

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Well, if you use scale to spread them all apart every vertices selected will spread apart. Make one style to shape, and duplicate them at the end to have as many as you want.