RE: ran car with the Hpi aa5 and 13 and 18 th clucth bell
It almost seems like you need 2 needle bearings. I think that would work perfect. That would give you room on top of the clutch bell to tighten it up, and so the bell would spin freely. So yah I think your right you need a spacer or something. With one needle bearing it sits very low inside the clutch bell, Thats why I think u might need 2 of them to get it to work right.