Pullup Bar and P90x pullup question

[Peggy T]

Ok, so I started P90X this week. I have a pullup bar from Dick's that I have (and is installed ) for a couple of years now. Well, today, it fell out of its sockets (with me landing on my back on the floor). It's the kind that has a round mounting bracket into which the bar slides. Obviously, it is not tight enough. How do I make the bar longer so that it fits more snugly?

Second question: Tony refers to a "reverse grip pullup". Wouldn't that be a chinup??

I am liking P90x. I had it and sold it soon after it came out because I couldn't tolerate Tony, but now he seems ok. Go figure...