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if you put 9 rubber bands on it will be quit powerfull you can put more on if you want but you will have to be strong to ...
Knex Cross Bow Center Fire (instructions)by Lucas The Boss
easy knex elastic band crossbowby Max1zac
Moving Valentines Boxby dansmith12334
knex bow and arrow/finger crossbowby yubnubber
Knex Yoyoby 302422
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