Estes2231 Fin Alignment Guide Model Kit, Color Varies

The standard center post does not fit over the top of either of the mini posts. All other fits good. I have sanded both over 30 minutes. Replace?

Is there any way to use this to set fins that are up higher on the body, and not at the very bottom?

Does Estes sell the fins separately? I can't seem to find just fins.

Can the fins be glued at an angle to induce spin?