[3D Printing]  Help with Redesigning a BU Blade

Hi! So, I decided to redesign the Beyblade in my pfp, Parhelion Yatagarasu. So far, in regards to the BU Blade (Parhelion), I’ve decided to reduce the width of the rubber contact points (the black parts), but I’m still confused as to what should be done with the blank spaces on the top and bottom of the Beyblade. Any ideas? Also, this Beyblade is supposed to be a Balance Type.