If you have old hard drive disks lying around then you should use them to make this long spinning top!
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Step 1: Get the Parts
A hard drive disk (more than one is good for longer spin time)
A metal bar such as in an erector set (you can use a screw or nail too just not on a nice floor) ;)
Last you need a bottle cap with a hole in the center
A drill to make the whole in the cap
And last but not least, a hot glue gun
Step 2: Assemble
All you have to do now is to glue the bar in the cap, and then the cap to the disk(s). This vid will show you how to use a string to spin it and how well it spins.