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i dont know why i've never seen this on instructables but here is my block trigger mod that will close automatically.
This one is ambidextrious (it goes boyh ways.)
Mod: Tiny Tortureby livetobelieve
Mods to the knex rifleby Bugman9
Knex Two Stage Railgunby jollex
K'nex Block Trigger Effeciency Booster.by LvNo1000
micro knex gunby jeansl10
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