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Keywords are:  'thief skill scrap equipment scrapping scrapper'

Skill: scrap equipment          Lvl 28 Thie  (28%)
                                (helpful)   Requires: salvage equipment and metallurgy
                                Group: Thief tinkering
                                Profession

Usage:
scrap <object>

This skill allows a thief experienced with metallurgy to break down
metal weapons, armor, parts, liquid containers and treasure such as
jewelry into raw materials for forging. Pieces are often broken when
rendering them down for scrap. Catastrophic failure, particularly of
very small, complex or highly magical pieces, is common, even for
expert scrappers.

Use of this skill does not require a forge. The object is merely
disassembled and the choicest pieces of metal saved, as opposed
to attempting to melt down the entire object, which would result in
hopelessly impure and contaminated metal. Higher difficulty metals
are more difficult to scrap. Thief level and skill proficiency
determine success, and high dexterity also helping.

The resulting scraps can be used at a forge for making new objects.