[lincpimp]

Best thing is to find heatshrink that fits as tight as possible before you shrink it. Cut it about 1/4" longer on each end, 1/2" total, and evenly apply low heat to it. If you heat it too fast it will distort, and if you apply too much heat it will melt. A std hair dryer will work fine. I use a heat gun, but move quickly and do not get too close.