Unfortunate report on the ultra low inverted kingpin 9” I’ve been riding for a while, they’re for sure getting worse with age. What used to be a nice stable surfy turn is now wiggly and divey, due to how small the top bushing is.
As others have mentioned, as the top bushing breaks in it’s basically just becoming a little pancake with no resistance. So top part of the turn feels like on a truck with a shaved down bushing, not quite Daewon style but close, and then the rest still has that linear feel. Not unusable but not ideal, especially compared to the Ace/Stage IV turn I prefer. Will probably continue to run these until the 161 TIIs drop, but will likely abandon them after that. Maybe run the baseplate on a curb only setup with different hangers or something.
I’d imagine standard Slappys don’t have this issue, but maybe I’m wrong and it’s actually something with the formula of the bushing and not the size.