From the previous discussions around this, I came up to this (Please see screen shot).
Option-1 - I tried to change the color of the shaft openings from the linked file - Failed
Option-2 - I just tried that I can convert the bounding box of the Shaft openings as a rectangle in to my file, But don’t know how to proceed.
Thanks in Advance.
Here is one of the possible way.
Thanks a lot Mr. Kulkul.
You saved my day.