Having completing an entire project using JIS symbols, you are told the client would rather have JIC style symbols. Never fear ‘Swap/Update Block’ saves the day.
If you are planning on going project wide, I would recommend making a backup first.
Active drawing is better for testing your selection to verify results before going project wide. If your not happy with the results simply close the drawing and don’t save. Be sure to set the proper scale. Some library styles are in metric other are not.
Here is a before and after example after switching from JIS to JIC.
The tool in action…