Few years ago I built a door jack out of some iron I had around, and an old camper jack. Adjustable and goes pretty high. Helps when R&I door or just simply rebuilding or changing hinges. Saves the back, and lower corners of doors, and more stable than a floor jack!
Now i feel the need for one of those. And i happen to have a camper jack or three laying around. Plus the casters that i put under my e-wheel that i am removing.
