I have a bunch of old hard drives, I may make some balancers and donate them to my club to include in their monthly raffles. We all buy tickets at the end of the meeting and winners choose from an assortment of small prizes. I dont know who is donating the stuff...
Other than the magnets and the hand spinner there's nothing to building this.

These magnets are very strong, I'm sure they would hold any size prop. just a question of how high you make the side supports.

Then again, my wife would probably want me to finish that railing on the stairs thats been unfinished since fall....

pop