A blow drier may work - never tried one. I use a cigarette lighter and wave
it under the shrink tube until it shrinks completely. Be careful not to get
it too hot or it will melt. A quick bit of practice and you'll figure out
the right speed and distance to do the job perfectly. If you've never used
shrink tubing, you're gonna have a ball. It's one of those simple minds,
simple pleasure things - it's just neat to watch it shrink down and conform
to the item inside it.
