Please excuse me if this is in one of the stickies somewhere, but the Between a Rock guide needs a bit of an update.
"Ask him what he is doing. He will tell you that he is trying to get through the Wall but that everyone else gave up and nothing he tries can break through. Once you are finished talking to him you need to go south and take the Ferry back over the River and talk to the three Dwarves, and the Dwarves Engineer. The Engineer will tell you that he knows of a person named Rolad that may know how to break through the Wall."
Actually, you have go to Keldagrim now to the Librarian, then to the bottom floor of the gigantic palace to speak to the Engineer.
"Piece 1: Read the Book you got about the Rock, flip to the back of it. You will get a part of the Schematic.
Piece 2: Now go east then south and cross the River again. Speak to the Dwarven Engineer, he will give you a Piece.
Piece 3: Teleport to Falador or Camelot and head to White Wolf Mountain. Go underneath. While underneath go to the little Room with all the Dwarves in it. Talk to the Engineer in there and he will ask you to get him a Dwarven Stout. One re-spawns on the Table nearby, pick it up then use it on him. The Engineer will give you the third Piece of the Schematic.
4. Take three Gold Bars and go to an Anvil. Use one of the Bars on the Anvil and select the Golden Helmet option."
For Piece two, the Dwarven Engineer is again in Keldagrim.
For Piece three, you can easily ride the mine carts from Keldagrim to White Wolf Mountain instead of teleporting.
Also, there's an anvil in where the Dwarven Engineer is in Keldagrim, you may want to mention that.
And you may want to mention that the Avatar can't be harmed at all until you mine the gold.
