Mechanical spider leg 6 was removed after an update.
The contents of this page no longer exist in RuneScape, and this article is kept for historical purposes.
The mechanical spider leg 6 is found in the darker dimension during the 2016 Hallowe'en event. It is east of the Invention Guild entrance, on the dwarven multicannon. All 8 legs and 500 reward points can be exchanged for the Dr Spider MD pet.