Blow your own air-horn

Step 2: Drilling.

The air-horn needs two holes, one for air to enter, one for it to leave. The exit hole, in the centre of the cannister's base, is most critical, since it needs to form an air-tight fit around the straw.

If you pause and check the fit every few turns, you should reach a point where the straw can be pushed snugly in without being crushed or distorted.

Drill a second hole in the side of the cannister, roughly the size of the hole in the base. Scrape the edges smooth, as this is where your mouth will be going.

Comments

[Visitor]

To get a photo of the hole, place a piece of white paper inside the can. Use a crumpled piece of paper (or whatever you have) to press the paper against the inside of the can. Take photo. The white paper should highlight the hole nicely.