How to hem jeans keeping original hem

Ever altered a pair of jeans and felt like crying because it look nothing like the orginal u liked? Ever had a pair of jeans altered with white hems instead of its original cool dirty yellow thread? Ever wished that there's a way to sand the altered hem so that they will looked as cool as they did before the alteration? Finally, there's a relatively simple way to save us shorties the pain. How to hem jeans