The world is full of people who are severely mechanically challenged. For these people, fixing things can best be categorized by the statement: "this is a problem that can be solved by the application of cash."
Then there are those who claim that anything can be fixed by hitting it with a hammer. While sometimes (often?) true, knowing where to hit, and how hard, takes great skill and training.
For the rest of us, with limited mechanical ability, there are only two tools: duct tape http://tinyurl.com/5g6ayp and WD40 www.wd40.com If it moves, and it’s not supposed to, use the duct tape. If it doesn’t move, and it should, use the WD40.