I finally got some time tonight so I went ahead and took out my dermal drill and started notching the cylinder walls. It’s not a hard job to do but takes lots of patience and a steady hand. I had to swap a few sanding stones to get the botom side done so for the opposite side I will have to pickup some more sanding stones or a carbide bit to finish it off. My only suggestion is make sure you are wearing some protective glasses as metal shavings fly everywhere and also if possible wear a nose mask or a respirator.

Picture on the left is the un-notched block and the one on the right is notched.

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