Cogwheel

Source: npc/quests/eye_of_hellion.txt

1. In Eye of Hellion line, talk to Clanux Heffron (prontera 269,326).
2. At clue stage, pick In fact, I found this. (or alternate Nothing... route).
3. Clanux gives getitem 7093,1 (Cogwheel).
4. Use it at Unknown Machine#HellionMchn (prt_in 128,79) via Insert Cogwheel.

Note: this is a progression item, not the final reward.