Center Finder for round stocks

I saw a lot of similar design, but they usually didn't give clearance for the pencil(or pen or whatever marker do you use). In this model there is 0,3 mm offset from the centerlinne, since a common marker is about 0,5-0,6mm thick(pencils usually even a bit wider), so with this marker you get more perfect centers.
Scaling or resizing not recommended, because the offset and the wall thickness is goes away. If you need a bigger one write me a PM and upload to here as another version.
Size is quit