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

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

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bwrussell (author)2012-03-29

Guess what .16 seconds on Google got me:
http://www.youtube.com/watch?v=JYAVCDZm0MI

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