I have a design I'd like to laser cut and need to put a circle in the center of the red lines. 

Is there a way to place a circle in the center of each line without having to do it manually and keeping the thickness editable? 

For instance, if I change the thickness of the red line, the thickness of the circle would also change. 


[![enter image description here][1]][1]


  [1]: https://i.sstatic.net/3gJWl.png