When I had one, I made it spin nicely by cleaning all moving parts really well, and then greasing the gears with a heavy grease. I found that it spun a little too easily and kinda felt cheap, so I also added a large washer to the bottom to give it some weight, and I thought it felt great. You're never gonna get it to spin like a Tempest spinner or anything though... it's just not that kinda spinner (Arkanoid spinners have gears unlike Tempest).
DogP