2 ball bearing installed spool gear for ABU Ambassadeur Ultra Cast 4000-6600C. Original Abu spool gear drags on the axle shaft by design and slows down a cast. We alleviated that friction by supporting it with a pair of Abec 7 bearings and bored out the surface that used to run against the axle! Now the gear floats on the shaft and allows the spool to run even more freely. This gear shoud be used with 23404 idler gear and 23404 compatible idler gears.