Allen bolt and vertical bolt are part of the TENSIONER assembly. Not the alt. You have to loosen the tension on the belt before you can take the alt off. On my car (1994) the tensioner is on the (facing the car) right side of the pulleys. I had a pic to help another guy, but it got deleted. My digital isn't working right now either.

Pay attention to the directions if you decide to loosen the tensioner. Again, like I said, it is prone to easily break if you over tighten it. Just use common sense. I won't be back online for another 2 weeks or so. So good luck.

Keep us posted.

What ever happened with the air pump? BTW if it is not belt driven it is ok to let it go. No big deal. But if it is belt driven you have to address it.