Thats the PART THAT I DONT UNDERSTAND....I'm PORTUGUESE AND NOT USED TO RC TERMS...CAN SOMEONE PUT ME THIS IN ANOTHER WORDS OR PICS.....
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Aluminum spacer: slide on the topshaft before assembling the slipper kit.
Bearing: Replace stock plastic gear bushing with bearing supplied. To install bearing, you may need to remove a small amount of material off each of the 6 corners of topshaft, you can do this with fine sandpaper. Insert bearing into vented slipper plate (black) . Place on bench dished-side down on top of plate, line up holes and steps on tabs and screw together (Use Threadlock).