We have successfully added 2 ceramic ball bearings to an Ambassadeur idler gear. Custom machined in house, we have made these idler gears to fit 2 ABEC 7 bearings (supplied), which effectively increases idler speed giving you a longer, smoother cast. Idler will fit a multitude of reels from 4000 up to 6600 size. This includes most all classic style round Ambassadeurs. Original gear part number is 23404.