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So you haven't seen it done then.
DIY SOLAR TUBES EVACUATED VACUUM TUBE Solar water heater
Dead Easy Cream Cheese
The Care and Feeding of the Armalite AR-7
Pulling up small trees, the easy way.
Build Your Own (metalworking) Lathe - Part I
Make your own Rifle Cartridge Pen blanks
Build yourself a portable home - a mongolian yurt
Hard Tack
Copper Plumbing Alcohol Backpacking Stove
Multi-function Walking Stick III - Torch Bearer
Bio fuel briquettes, compress paper pulp and sawdust into fuel bricks.
Tormato! Tomato Cage With Trellis and Nutrient Delivery System
Grow Your Own Cooking Oil
How To Build Your Own Strawberry Tower
VAWT Lenz type. Stage 1. Converting wind power to rotary motion.
Cheap and Easy Passive Solar Water Heater for your Home. ($300)
Concrete Countertops for the Kitchen - A Solid Surface on the Cheap
How to Build a Polished Concrete Desk
Vacuum Former
Wood-Fired Brick Oven
Dust Sniper (quiet extractor system)
Programmable Smart Solar Oven
Electric Long Bike
Homemade 100 HP Motor Controller for an Electric Car
DIY Plug-In Hybrid Car
Chainsaw Mill
So you haven't seen it done then.