I will include surprisingly well-written instructions, but this is moderately complicated, and you should know what you're doing and have a decent soldering iron. Please see my pictures for details.
US shipping and handling is $5, and international is $18, no matter what quantity you buy. All my small parts are set up for combined shipping, so just use the "add to cart" feature and then check out all at once, and it will combine shipping. If you have any questions, please ask.