Nooooooooooohhhhhh!!!
PLEASE, no extension bars on ratchets! I really get sick of lads at work wrecking ratchets when using scaffold tubes to extend handles. I've seen even quality 3/4" drive ratchets break like this.
Ratchets are for ratcheting!
Use a solid connection, like a T bar or better still a proper breaker bar.
And a proper lump hammer for a solid thwack, not a rubber mallet...