External Links - Drilling Used Portable Rigs for Sale (Drillingfab.com) Overview Comparison of Simple Drilling Methods (WELL Resource Network, UK) LS-100 & 200 Portable Mud-Rotary Drilling Rig Portadrillmini Eureka Port-a-Rig - Air and Mud Rotary (Malawi) Pounder Drill Rig (Uganda) Build Your Own Drilling Rig (Drillingfab.com) Drilling Water Wells by Hand (Int'l Health Care Foundation) Hand Powered Percussion Drill (Liberia) Sludger Technique (Nepal) Forager Drill Cable Tool Drilling Well-Jetting Technique (Nigeria) Well-Jetting Background & Training (Madagascar) Step-by-Step Jetting Instructions (and many links)