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Knex Grappling Hook

I had an Idea. Basically, you have a lame set of grappling hook arms that dont Do anything, well change it so that when the hook hits the object, it closes the arms....block trigger perhaps.
I know I Am Canadian, Shadowman ect would be able to design and build this in like 30 minutes, but i was thinking someone could give it a try...im working on it too!
Thanks in advance
Hedzup456