NEED HELP WITH A SLOT MACHINE.

Hello,

I'm trying to make a rock-paper-scissors slot machine type minigame. Simply put, I have a picture strip with a fist, palm, and scissors on (like slot machine pictures, beneath each other). They start spinning, you press the button, it randomly selects one of the three and stops there.

Anyway, what I need help with is making the picture loop. The picture moves down, but then I need the same picture to re-appear right above it to make it look like it's spinning. If this is confusing, just think of the parallax background in Rm2k3 moving vertically, only with pictures.

I've tried to do this by showing the picture strip, moving it down, then erasing it and immediately showing it again in the starting position. Unfortunately this still shows a slight gap.

Does anyone have suggestions as to how I could accomplish this?