*EDIT I modified design so it works better, i added washers to go between wheel things and changed design of pin to be same as axis. So images are little not up to date but i think it still okay
here are pictures of how it is assembled:

You have 8 keys, each with a unique shape. You need to insert them into the correct position out of 16 possible options. Then, you can use a pin to test if you have solved the puzzle. If the pin goes through the hole, you have unlocked the puzzle!

Thanks for downloading and rating this design, also feel free to check out my other designs!

Plates should be inserted into device in this order: