I have bought many of these small working puzzles and recently saw this one on business cards. I was able to build this in under 2 hours. This toothpick was a bit painful to install. I broke a few pieces in the process, but just in case they send more. It took some time to "break in" the gears to open and close on their own, but it's a nice puzzle/working model nonetheless. Now it works without any problems. Highly recommended for those who love puzzles and models.
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