What is my seal called?

Ruger64 said

I didn't think it would come off by hand? I thought it was really tight.



LOL....

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I have always done them by hand just not to have the impact hammering on the pinion/ring gear. Put a cheater pipe on a breakover bar if you need to.

I have never had one that was really hard to remove as long as the threads were cleaned up and some oil applied on them.