Very cool! Yeah, you may need a rebuild kit, but if you do lube the existing bearings, 3 in 1 will work. I wouldn't use grease, unless its a VERY thin grease. Grease just slows the trackball down really quick. At least it did on mine; I ended up soaking the bearings in "Gunk" industrial cleaner overnite to get the grease out so I could start over. The bearings in my game were not completely sealed, so I was able to easily put oil in there to keep them rolling smoothly. That was my experience. Others may have had luck doing it a different way.