If you have no wobble in the shaft then you have a short cap on a tall cap unit or a tall rotor on a short cap unit. Don’t feel bad about it, lots of broken caps and rotors over these many many years. As MikeE aptly stated above, match the components and all will be well.

Martin
'62 Chevy C-10 Stepside Shortbed (Restomod in progress)
'47 Chevy 3100 5 Window (long term project)
‘65 Chevy Biscayne (Emily)
‘39 Dodge Business Coupe (Clarence)
“I fought the law and the law won" now I are a retired one!
Support those brave men/women who stand the "Thin Blue Line"! Hug a cop!
USAF 1965-1969 Weather Observation Tech (I got paid to look at the clouds)