plz i really want a cool and owsome one
My one is three speed if you include neutral;https://www.instructables.com/id/Knex-Gearbox-Transmission/
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you cant because there is only two gears that will fit on the same connector.
You know what I would do? On second thought, you probably don't care what I would do, but I am going to tell you anyway. I would take a look at what others have done, (see the right hand side of this page) learn how it was done and then experiment with ways to improve or modify it to my own liking. For me, half the fun of doing new things is the learning experience. If you don't get it right the first time, figure out what you did wrong and try again. The only way you can fail is to not learn from experience. But even better, is the feeling of success. You can congratulate yourself and tell others, "I did this. This is mine." Furthermore, you become the expert, others will come to you for help and advice, and that, that is truly gratifying.
This one's three speed if you include nutral. www.instructables.com/id/Coming_soon_to_instructables/