Catapult Construction/Quick guide

Fetching the materials

 * North of the Tyras camp, talk to the guard next to the catapult. (Chat 2-1-1-1)
 * Talk to General Hining in Tyras camp. (Chat 1-1-2)
 * Teleport to the Tirannwn lodestone
 * Follow the path north-west, over the leaves trap. Hug the left hand side and pass the stick trap.
 * Talk to the engineer.
 * Talk to him again for schematics. (Chat 3-2)
 * Click the schematics, option 3.
 * Talk to the engineer, he should let you read the note. Don't leave until he does.
 * Talk to Rolad, a dwarf south of Ice Mountain. (Chat 2) (Falador Lodestone)
 * Talk to Thaki in Port Sarim's pub. (Chat 2) (Port Sarim Lodestone)
 * Search the drunken sailor outside.
 * Wear the sailor's hat and talk to Thaki again.

Building the catapult

 * Talk to the guard next to the catapult.
 * Copy the solution below. Use the big buttons to swap sides.

Catapult testing

 * Talk to the guard. (Chat 1)
 * Shoot the middle rock - requires 1 blue bar of counterweight.
 * Left rock - 6 blue bars.
 * Right rock - 7 blue bars.
 * Talk to the guard again.
 * Quest complete!