Yes, somebody drilled and tapped it for a bolt then probably used the bolt to press the dampener on the crank instead of using the proper installation tool.
I actually saw a "proper" installation tool once for these older pressed on balancer engines. I wish I knew where that was. Has anyone seen them? Maybe someday I'll build one.
Oh there was mention of "RED" Loctite, I wouldn't do that on any bolt that I wish to ever remove, read the label its supposed to be permanent, or requiring a bunch of heat to soften it to remove the bolt.
