Marco Angulo sent me pictures from his latest project: Making a slingshot out of a bull horn.
First, get a bullhorn. Unscrew one from a nearby bull :-) and get it roughly into the right size with a metal saw.
Mark the edges of the future shape...
...and drill holes on the markings. Horn is tough and diffucult to process with a saw.
Take a file and smooth it out.
Done! Now you have to attach the rubber:
That's ist! You got a beautiful bull horn slingshot.
Thanks, Marco, for these great pictures!