I used a strait edge to cut the slots.
Be careful not to over cut the corners. I pressed the tip of the blade into the corner and stopped the cut before reaching the end of line.
The tube was turned around and the cut was finished from the other side.
To strengthen the body tube and the cut out ports, thin CA was applied to a cotton swab and rubbed inside the body tube around the cut port edges.
A small amount of CA was also run around the ports from the outside. Any buildup of the super glue is easily sanded smooth.
Here's a finished port after sanding the CA glue smooth.
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