How to make the perfect spiral tube (or any other glassware)

Glassware, spiral tubes and any other device with a spiral inside it is often used to create a decorative display.

These devices can be a great decoration or even serve as a tool to create your own designs, so why not try them out?

Here are some tips on how to make your own spiral tube or glassware that is a little more decorative and functional than those found in the market.