Before you start cutting and installing an inspection port, think about this option. On "Mmmmm" I centered the prop while the boat was out of the water. I then took a piece of white electrical tape and wrapped about the shaft. On the top of the shaft tape, I marked an arrow with a felt-tipped pen. When we center the prop before a race, we simply slide the steps forward a bit, turn the prop shaft by hand until the arrow is on top of the shaft, and yell up to the skipper "LOCK." We engage the throttle in the forward position and we're good to go. A simple solution that never fails and it's cheap...unless you're paying a lot for about three inches of white electrical tape!
Bob Rude
Mmmmm
#352