"regenators are a way to get items without going hunting for them whit a way to do it manually"
You can make Coblestone AND Obsidian regenerator since the 1.10 update. Here is how to:Edit
The cobblestone will be created in the middle.Make shure the water OR the lava dosent touch the other source.
Obsidian Regenator:EditMade a constraption where the lava OR the water DOES touch the other source this will make the source convert into obsidian.
PS: The source WILL be lost.