Kirbfan94,
I solved my Kirby nozzle rattle. Thought I'd share the solution in case it helps.
The problem was in fact, in three areas.
Rugplate rattle. New gasket helped, but deep vibration persisted.
One End support brackets needed squeezing slightly tighter.
Main problem: New Brushroll's height was out. (I thought it was okay). Needed 2 1/2 undo turns on each end-screw to retract roller slightly.
Hope it helps.
