Back in the dim past when most outboards had two notches in the rope sheave for starting, I used this copy of an early Evinrude flywheel holder.
Another special tool from the mid 1930s was the Spanner hook.
However when they came out with the 40 horse using over 100 foot pounds of torque this would not do. I tried a holder that used the ring gear teeth.
It bent and slipped. so I got a chain pipe wrench with an extra chain to fit the largest flywheel. For tough jobs I slip a pipe over the handle. It has worked for over 50 years. . . 😉
