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are you talking about this crown piece? If so then you have to use the version from this thing and apply the same scaling to it that you did on the shell. If you scaled the shell down to 96.71% then you have to scale down the crown to 96.71% as well. The original crown piece will not fit and the crown piece from this thing also contributes to the height of the shell. If you use any other crown piece your shell will not reach the necessary height.