The first time I wanted to do a Tunisian crochet project, I hurried up and bought 3 long Tunisian crochet hooks. You might not need that. It depends. 

You can make larger projects with a long Tunisian crochet hook. But, if your project is a huge afghan, then you might actually need a hook with a loooong cable in the end - to have room for all the loops on the hook. Though... keep reading!

Scarf or Tablerunner?

If you just want to try out the art of Tunisian crochet with smaller samples - OR - if you are just creating a scarf or a table runner or a small/medium-sized pillow - then maybe you don't need to buy a new hook (sorry!).

You can use a regular crochet hook. One of those straight ones with no handle. Around 15 cm (6 inches) long. 

A regular hook can hold a lot of stitches. Twist a rubber band around the far end, to make sure the loops don't fall of the hook.

I recently created a scarf using 10mm hook and a rubber band. I did the Tunisian Top Stitch with a thin mohair yarn and the scarf is 45cm (almost 18 inch) wide. There were plenty of space on the hook. If you consider doing the same with a more dense stitch, then do a test, to be sure it will fit.

Cabled Hook

• Prepare the end of the string with some tape. 
• Push the hook and the string together and lay another piece of tape on them. Make it diagonally for premium support. 

Use thin tape to make it possible for the loops to pass the tape. I recommend insulating tape, which is also a little elastic. So it fits everything very well.

Disclaimer. The DIY extended crochet hook should work with an afghan as well as a scarf. There are NO guarantees though. An afghan is much heavier than a scarf. Be careful! Don't lose your loops :) 

Happy Tunisian Crochet!