Dwarf Cannon

Official quest description: Run errands for Captain Lawgof to repair his base and build his defenses
Release date: 27 May 2003
Start: Talk to the Captain Lawgof, south of the Coal Trucks.
Difficulty: *****
Length: Medium
Members only: Yes
Requirements:
Level 20 Agility is recommended
Items needed:
A Hammer
Teleport runes to Camelot or Games Necklace (recommended)
Teleport runes to Falador are recommended
Monsters to kill: None
Spoiler warning: Plot and/or ending details follow.
edit Walkthrough
Pick up a hammer from inside the house to the north-east of Captain Lawgof.
Talk to Captain Lawgof. Agree to help him repair the fence, and he will give you six railings.

This image shows you the railing that has to be fixed.
The damaged railings around the complex are bent; repair these by "inspecting" the appropriate sections of railing. Some bent railings are difficult to find. It may help to adjust the camera angle so that it is viewing the fence. If you fail to repair a rail, you may take 1 or 2 damage or your strength may be temporarily reduced. Whether you fail or succeed is purely random.
Return to Captain Lawgof. He will explain that communications with the watchtower have stopped. Head south to the watchtower and investigate. Take the Dwarf remains you find back to Captain Lawgof.
Captain Lawgof will identify the remains of Gilob, who had a son named Lollk. He is missing, and Lawgof will ask that you find him.
Head south-east to a cave. You will have to walk around the Fishing guild to find the entrance.
Once inside the cave, it will fork into three passages. Take the center passage to find a goblin outpost. Go to the furthest room from the entrance. Search all of the crates, and Lollk will jump out. Talk to him and he will thank you. Return to Captain Lawgof.

The cave.
Lawgof will ask you to fix his broken multicannon. Use the toolkit he gives you on the cannon. You will need to match up three tools with the three parts on the screen that shows up. These must be done in order!
Use the hooked tool on the spring.
Use the pliers on the safety switch at the bottom.
Use the tooth tool on the gear located at the bottom of the hammer.
Talk to Captain Lawgof again. He will tell you that he doesn't know how to get ammo for the cannon. He will ask you to go to the Dwarven Mines outpost south of Ice Mountain to find out about the ammo.
Go to the Dwarven Mines outpost (northeast of Falador's northern entrance, northwest of Barbarian Village) and talk to Dwarf Engineer Nulodion. He will give you an ammo mould and some instructions. If in the future you need an ammo mould, you can speak to him and receive one for free if you do not already have one in your inventory. In addition, it can be purchased.
Finally, go back to Captain Lawgof and talk to him. Quest complete