I made this for the "Jack o' Lantern Challenge." it is a safe (Do not use as an actual safe). It does not need any external parts to function. in the following steps i will show you how it works.
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First you must slide the main rod in to the base via the notches this allows the freedom to spin.
Next turn it 90 degrees and slide the top part of the pumpkin over and make sure that the top part is aligned with the bottom.
Finished! Spin the root to open it.