Large steam turbine blades are attached to the rotor with a machined base called a christmas tree root that fits tightly into a similarly shaped groove in the rotor. In the field, the blades were driven into the groove with a sledge hammer. The bladers who do this for a living, have arms like the Govenator and wail on a brass drift, being held by their partner, with that 12 pound sledge.
You already know where this is going and it's not pretty.
