Invention: A Small Compendium
Levels 1-4 can be completed by doing a small tutorial at the Inventor's Guild; Located just north of the Falador Lodestone.
(Click on the picture for more information)
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Levels 4-27 can be completed easily by creating Weapon Gizmos and adding components to them.
Weapon Gizmo Shell | Requires | 10 Blade Parts | 5 Crafted Parts | 2 Strong Component
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I'll start off by saying that there are "3 types" of disassembling. There's bulk-disassembling - where you break down thousands of an item for its common/uncommon/rare components. There's breaking down a few single items for rare components. And there's rare components which are expensive and gained from armor or weapons, so you level them up to lvl 9, which gives you quadruple components upon disassembling. There's no such thing as "oh there's X item on the ground, let's disassemble it". Those