Step 3: Cut out Paper Platter
Grab a piece of thick, white paper and trace the outline of a platter (both the inside and outside). Cut out your paper platter, and widen the central hole a few millimeters. Slip this over the spindle, and push it down to the floor of the platter chamber. You might need to trim the paper a little so it doesn't rip. This will serve as a white, reflective backing, making the color in your LEDs shine more vibrantly.
Once the backdrop is positioned, make sure the spindle can still spin freely. If it can't, trim the center hole of your backdrop.