I picked up a Happ 3" trackball from a fellow KLOV'er, and it was missing the encoder wheels. I got the wheels, but I just realized that when I screw the wheels on, they wont turn because the roller shafts don't stick out far enough. I believe these rollers are not the correct rollers for this type of trackball. Can anyone tell me what other brand of trackball my shorter shanked set of rollers will work with?
