Harmonic balancer

Maybe one of you guys needs to design a stop that bolts across the starter mounting holes that uses the flywheel teeth.

I have used a 1/2 pipe to sit on a converter bolt head with the other end over the head of a pan bolt before and it worked fine.
Have also put a big screwdriver between the ring gear and starter opening up on edge so it jammed there.
Both worked for what I needed.