You must speak to Elder Yelnar on a hill in the water behind Dozekar (-1325, -1088, -233) and receive the quest before you kill Dozekar and loot the binding stone or you will not receive the first quest update and have to repeat the zone to kill Dozekar again to get your Binding Stone to drop a second time. Quest only updates if you have the quest when you loot the item.
Note: as of 160325, one need not address Elder Yelnar before defeating Dozekar. Once defeated and the Binding Stone is on one's person, just speak with Elder Yelnar, receive the quest, which will automatically update allowing one to receive the Binding Stone Modification.
You need the following components to complete the recipe. An optional portable forge (tinkered or via TS AA) will allow you to craft the combine without leaving the zone: