How to use Heat Shrink Tubing
Whip the ends of your lacing a couple of times using thread and needle, leave the needle attatched; pass this through your section of tubing and then roll the tubing (carefully) next to a candle flame or over steam.
Thanks to Emma for sharing this tip
"I use my heat tool from my stamps/embossing - it's very efficient and saves the worry about naked flames near your fabrics etc, just thought I'd pass
the tip on."