How can I erase part of my race without changing the rest of it?

I made an image of type circular Crest with a particularly well-defined race (so it looks like a stamp). I want only the exterior working STROKE and the inside be smooth (in the circle). Before I was just layering white on other circles, but now I need inside to be transparent. Is there a way I can convert my race into an object so I can easily erase the lumpy inside? If not, how can I get around this?circle.jpg

The top image is what I have, the lower image is what I want. Only to have a transparent Center.

Bokin,

You can:

(1) object > path > describe strokes,.

(2) select the new compound path and the circle that gives the desired inner border and Pathfinder > less before or less back, according to the stacking order (less first plan if the circle is on top).

Hi Kurt.

Tags: Illustrator

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