Responding to your concern as to how hard one can strike the tool
without breaking the crank shaft – at least this hard. This is the same
crankshaft that is in your motor.
Tubs
https://youtu.be/5rVYxvl20XY?si=klcBb647zzXKoKu3
A "Boathouse Repair" is one thats done without having tools or the skills to do it properly.