This is a remix of a great model that you can find here: link
Pls follow all the instructions from there till Step 2
Once you are at step 3, move all leaves to create the biggest hole as possible
Step 4 you can now add the other side, pls make sure the small sign on the side are aligned as per below image
Step 5 make a small turn counterclockwise till the block
Step 6 you can now rotate clockwise and the tool should work fine.
I think there's still room to improve the design in order to draw an even smaller circle, will work on that in the future.
Let me know any feedback on this design
The author remixed this model.