Mild home head porting advice .

Plenty of input from the more knowledgeable here on what to focus on. I've done enough work with grinders to know "control" of the tool is critical. Practice on scrap iron, junk heads, etc, tubes, ports and get a feel for how various cutters " cut", and learn to prevent chatter and the the tool getting away from you, too easy to go too far, and possibly ruin something