Yes you have to turn it counter-clockwise to removed ( left), and when you are putting it back clockwise (right)
I found one more post to reduce the space for the drive 20 mm to 17mm and I tried once, but I forgot
to make 2 notches on the side of aluminum pill like you can see in the photo of the post and my pill cracked when
I press the brass part but is a fast way to do it and the 17 mm drive will fit very well. Thank you for let us know
about the 20 mm blank disks. I am going to order some.