THE WORST ANSWER TO ANY question is "if you have to ask you shouldn't do it." That's the bogus answer you get from people who either cannot explain or do not want you to know. Take for example setting up differential gears. There are those who can do it and those who haven't learned how. Setting up gears isn't impossible, and anyone with enough practice, proper tools, common sense, and perseverance can learn to set up an axle ring-and-pinion.
展开▼
