Get Blueprint Perfectly Timed Differential Drop Rate Pictures. Yea i just did it on heroic like they said and nothing dropped for me, i checked the bags on my warlock and bank tab, also checked pascal to make sure i did not already learn it. Perfectly timed differential and blueprint:

Yea i just did it on heroic like they said and nothing dropped for me, i checked the bags on my warlock and bank tab, also checked pascal to make sure i did not already learn it.

Instead of stats, it has three punch card slots: Did you read through the comments section on wowhead? <this item begins a quest>. This blueprint drops from king mechagon in operation: