Are new keel hangers necessary?

[David W]

I'm getting set to drop the keel on my new to me 1976 Cat 22.
I know I need the bushing but am not sure if the new hangers are necessary. I have the equipment to make large diameter washers of any thickness from stainless steel to take up any play between the keel and the hangers.
Just wondering what other folks have done when rehabbing their keels.
Thanks!