How to Build up a grip using a heat-shrink sleeve
Take a look at this instructional video and learn how to use a heat-shrink sleeve to build up your tennis racket's grip. To do this you'll need a heat gun such as a standard blow dryer to warm the heat-shrink sleeve. Be sure not to heat it at one point, you'll want to heat it all over evenly. You should never use more than two sleeves, otherwise the bevels will completely disappear.