how do you make a siren out of knex???

ive seen other sirens without instruckions made of knex but not one WITH instructions.
can you show me or make an ible on one and post the link on the answers collum. thanks

Picture of how do you make a siren out of knex???
Sorunome5 years ago
Nice Cat
bwrussell5 years ago
Guess what .16 seconds on Google got me:
http://www.youtube.com/watch?v=JYAVCDZm0MI