Dave & Kirby handle pivot assy...
Kirby does NOT offer any parts for repairing the springs.
If there are such anywhere, they are not thru Kirby.
(I actually took my first one apart about a week ago, just to see how it was made inside. Maybe it was 'my' commemorative to the "G Series" 20th Anniversary, to 'peek at the hidden insides.' LOL)
mho--I don't know that I would/will attempt repairing one of them (for restoring purposes). I think in that case i would just hold out for a 'good' one.
hagd all
Bill